Workarounds for bugs in the OpenSCAD snapshots.

The first one is now the type that defaults to the previous BigTreeTech version.
The second parameter is the shaft length overrride.

Added ESP32_DOIT_V1, ArduinoNano and KY_040 breakout PCBs.

CHANGELOG.md

@@ -3,6 +3,229 @@
 This changelog is generated by `changelog.py` using manually added semantic version tags to classify commits as breaking changes, additions or fixes.
 
 
+## [v16.0.0](https://github.com/nophead/NopSCADlib/releases/tag/v16.0.0 "show release") Breaking Changes [...](https://github.com/nophead/NopSCADlib/compare/v15.25.0...v16.0.0 "diff with v15.25.0")
+*   2021-09-11 [`3299aad`](https://github.com/nophead/NopSCADlib/commit/3299aad5c83d1fe21d3bdddd1450f8de19078d13 "show commit") [C.P.](# "Chris Palmer") Parametric potentiometers added, changes PCB "potentiometer" parameters.
+The first one is now the type that defaults to the previous BigTreeTech version.
+The second parameter is the shaft length override.
+
+ * Added `ESP32_DOIT_V1,` ArduinoNano and `KY_040` breakout PCBs.
+
+*   2021-09-11 [`74c52aa`](https://github.com/nophead/NopSCADlib/commit/74c52aac0428995930b4af562a480025003b992d "show commit") [C.P.](# "Chris Palmer") Can now make perfboard without screw holes.
+Fixed missing items from last commit.
+
+*   2021-09-11 [`726d9ed`](https://github.com/nophead/NopSCADlib/commit/726d9ed2dc921b5a7ef8c5b0fa6b17628f706bf8 "show commit") [C.P.](# "Chris Palmer") Can now draw right angle Molex KK connectors and can skip pins to allow high voltage.
+
+*   2021-09-11 [`8a838dd`](https://github.com/nophead/NopSCADlib/commit/8a838dd1ceaac7d595aea47494cb28b9a424ee8a "show commit") [C.P.](# "Chris Palmer") Added `pcb_grid_components()` module for placing parts on a perfboard.
+
+*   2021-09-11 [`181c6ac`](https://github.com/nophead/NopSCADlib/commit/181c6ac6248e7db6204b6d461f122e719492b0cc "show commit") [C.P.](# "Chris Palmer") Added `vero_pin` PCB component.
+
+*   2021-09-11 [`e952aa7`](https://github.com/nophead/NopSCADlib/commit/e952aa7840cf4f3765c518a481d32f582bef27b4 "show commit") [C.P.](# "Chris Palmer") PCB chip component can now be round if width is zero to fake round buttons.
+
+*   2021-09-11 [`466ee31`](https://github.com/nophead/NopSCADlib/commit/466ee31e10e670ff35e22429084a34612f821f7d "show commit") [C.P.](# "Chris Palmer") Added `Jack_4mm_shielded_nut_radius()`.
+
+*   2021-09-11 [`4c926c5`](https://github.com/nophead/NopSCADlib/commit/4c926c529b199dbe589fb0c43f323db94ffe5597 "show commit") [C.P.](# "Chris Palmer") Fixed axial lead min pitch bug.
+
+*   2021-09-11 [`edb1ecc`](https://github.com/nophead/NopSCADlib/commit/edb1eccbf156ff4b06723b18f832637328b1c3e0 "show commit") [C.P.](# "Chris Palmer") TFT128x160 LCD display added.
+
+*   2021-09-11 [`061812c`](https://github.com/nophead/NopSCADlib/commit/061812cc8bc51e5a957d7d3acaffd9bcda14cc15 "show commit") [C.P.](# "Chris Palmer") PMMA1p25 sheet added.
+
+*   2021-09-11 [`ce0c97b`](https://github.com/nophead/NopSCADlib/commit/ce0c97b45e6e501554e66bcd4140d4dd3f532a1c "show commit") [C.P.](# "Chris Palmer") `7_segment` displays added as PCB component.
+
+### [v15.25.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.25.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.24.0...v15.25.0 "diff with v15.24.0")
+*   2021-09-05 [`2166a9b`](https://github.com/nophead/NopSCADlib/commit/2166a9be6a6fc75b06f0051971606cd181079e15 "show commit") [C.P.](# "Chris Palmer") `extrusion_corner_bracket_assembly()` and `extrusion_inner_corner_bracket()` can now be passed the extrusion type.
+E2020t and E4040t thinner extrusions added to work with the brackets.
+Extrusions can now have recessed channels, round or square centre sections and holes.
+Fixed the shape of extrusion centre section spars.
+T-nuts now have 45 degree chamfers instead of a fixed 1mm minimum thickness.
+
+*   2021-09-03 [`5117290`](https://github.com/nophead/NopSCADlib/commit/511729008dcc878a148c3bbd00edf69de9736fb5 "show commit") [C.P.](# "Chris Palmer") Added missing documentation for `sliding_t_nut()`.
+
+*   2021-09-03 [`5111ec0`](https://github.com/nophead/NopSCADlib/commit/5111ec04bc1d19cc46b811bf79d026fcd2ca70f8 "show commit") [C.P.](# "Chris Palmer") `E40_corner_bracket,` `E40_corner_bracket` and `M8_sliding_ball_t_nut` added.
+Inner corner brackets now show the long arm with chamfered ridges rather
+than a normal T-nut and the grub screws are inserted to meet the extrusion.
+
+### [v15.24.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.24.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.23.0...v15.24.0 "diff with v15.23.0")
+*   2021-08-31 [`d9af5b7`](https://github.com/nophead/NopSCADlib/commit/d9af5b7f705791ca8ef230ecd1b831c042587002 "show commit") [C.P.](# "Chris Palmer") Updated images and readme.
+
+*   2021-08-31 [`9d65f69`](https://github.com/nophead/NopSCADlib/commit/9d65f69bf3e7cd325d24bc5410a4763bb7164b8f "show commit") [M.B.](# "Martin Budden") Added `M2p5_dome_screw`.
+
+### [v15.23.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.23.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.22.0...v15.23.0 "diff with v15.22.0")
+*   2021-08-31 [`00c5c90`](https://github.com/nophead/NopSCADlib/commit/00c5c90a5e74f47f0e6f5e3a7996f70fa34f0833 "show commit") [C.P.](# "Chris Palmer") Updated big picture
+
+*   2021-08-31 [`01c26d8`](https://github.com/nophead/NopSCADlib/commit/01c26d8a349e802738a8b0d06575a3e6915bf070 "show commit") [C.P.](# "Chris Palmer") Added Lichuan servo motors contributed by Niclas Hedhman.
+
+*   2021-08-31 [`ef21024`](https://github.com/nophead/NopSCADlib/commit/ef2102420b15e5be4008a6a3cecf5416857265f9 "show commit") [C.P.](# "Chris Palmer") Added NEMA8 and NEMA8BH stepper motors.
+Steppers can now have dual shafts, hollow shafts and black end caps.
+
+*   2021-08-31 [`540f841`](https://github.com/nophead/NopSCADlib/commit/540f84116355e7f44a9b5796816d1e3422128ff3 "show commit") [C.P.](# "Chris Palmer") Added crude representation of JST ZH connectors.
+
+*   2021-08-31 [`1045502`](https://github.com/nophead/NopSCADlib/commit/1045502efb1cb94fb7bcc11fd4483b425a880926 "show commit") [C.P.](# "Chris Palmer") Added more aluminium sheet thickness
+
+*   2021-08-31 [`485184f`](https://github.com/nophead/NopSCADlib/commit/485184f09213ff0b191d5c8339471cd24ba3cc90 "show commit") [C.P.](# "Chris Palmer") Added HGH15CA and HGH20CA rails.
+
+*   2021-08-31 [`b893c90`](https://github.com/nophead/NopSCADlib/commit/b893c9069a6bae762733cf1e139d49bab28ad792 "show commit") [C.P.](# "Chris Palmer") Added SFU1610 ballscrew nut
+
+*   2021-08-31 [`69f4ced`](https://github.com/nophead/NopSCADlib/commit/69f4ced29da7e37c88ca24b924c6430144eec849 "show commit") [C.P.](# "Chris Palmer") Added `M8_cs_cap_screw,` `M5_grub_screw` and `M6_grub_screw`.
+Fixed `M6_cs_cap_screw` and `M4_grub_screw` socket sizes.
+
+*   2021-08-31 [`5c1aa84`](https://github.com/nophead/NopSCADlib/commit/5c1aa849fe5992617c3128c47dfc969504cbfd2f "show commit") [C.P.](# "Chris Palmer") New layout for big picture.
+
+### [v15.22.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.22.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.21.1...v15.22.0 "diff with v15.21.1")
+*   2021-08-27 [`1247303`](https://github.com/nophead/NopSCADlib/commit/1247303cb9dc2694994993b5dc046683becb7fde "show commit") [C.P.](# "Chris Palmer") Updated images and readme.
+
+*   2021-08-13 [`14ab1bb`](https://github.com/nophead/NopSCADlib/commit/14ab1bb8b614055e0bf4ad33799276b0017ca13e "show commit") [M.B.](# "Martin Budden") Added Raspberry Pi Pico.
+
+#### [v15.21.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.21.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.21.0...v15.21.1 "diff with v15.21.0")
+*   2021-08-09 [`be53547`](https://github.com/nophead/NopSCADlib/commit/be53547728834d8e786ad4cb5637c768320a3105 "show commit") [M.B.](# "Martin Budden") Fixed display of BLDC prop shaft when thread length `=` 0.
+
+*   2021-07-04 [`ba7d7d3`](https://github.com/nophead/NopSCADlib/commit/ba7d7d32adf554d163143c0ae1707565340bb35b "show commit") [C.P.](# "Chris Palmer") Updated chnagelog.
+
+### [v15.21.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.21.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.20.0...v15.21.0 "diff with v15.20.0")
+*   2021-07-01 [`df35e14`](https://github.com/nophead/NopSCADlib/commit/df35e14fc71794c3826d6c99ce3cab93a4cfa5fe "show commit") [M.B.](# "Martin Budden") Improved handling of pcb plating colour.
+
+### [v15.20.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.20.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.19.3...v15.20.0 "diff with v15.19.3")
+*   2021-06-29 [`c982876`](https://github.com/nophead/NopSCADlib/commit/c982876ebc0f95b466de1af3c80642dfd88800e6 "show commit") [C.P.](# "Chris Palmer") Can now specify the screw used for PSU shrouds and get the wall thickness.
+
+#### [v15.19.3](https://github.com/nophead/NopSCADlib/releases/tag/v15.19.3 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.19.2...v15.19.3 "diff with v15.19.2")
+*   2021-06-17 [`92d0444`](https://github.com/nophead/NopSCADlib/commit/92d0444e5f96c8f4768afb3d014044d7e66c6e69 "show commit") [C.P.](# "Chris Palmer") Changelog now runs codespell to fix the spellings in the commit comments.
+
+#### [v15.19.2](https://github.com/nophead/NopSCADlib/releases/tag/v15.19.2 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.19.1...v15.19.2 "diff with v15.19.1")
+*   2021-06-15 [`8d7c44b`](https://github.com/nophead/NopSCADlib/commit/8d7c44b80deffcc8c6b84c7a6485c959826cb381 "show commit") [M.B.](# "Martin Budden") Spelling corrections.
+
+#### [v15.19.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.19.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.19.0...v15.19.1 "diff with v15.19.0")
+*   2021-06-17 [`d38055c`](https://github.com/nophead/NopSCADlib/commit/d38055c15c8b00f91f9c5a4749264acc9b123aad "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-06-11 [`dcfe426`](https://github.com/nophead/NopSCADlib/commit/dcfe4262c519fb750702564309b790cda5b1c090 "show commit") [M.B.](# "Martin Budden") Fixed typos.
+
+### [v15.19.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.19.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.18.0...v15.19.0 "diff with v15.18.0")
+*   2021-06-17 [`c7a6d81`](https://github.com/nophead/NopSCADlib/commit/c7a6d8164f545e83c4d871080ac63b7d903829df "show commit") [C.P.](# "Chris Palmer") Added `molex_usb_Ax1()` and now shows SMT caps in the PCB test.
+
+### [v15.18.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.18.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.17.1...v15.18.0 "diff with v15.17.1")
+*   2021-06-08 [`d1a17bd`](https://github.com/nophead/NopSCADlib/commit/d1a17bd4ac90a7d3d6de7c4d4d032e8198c48647 "show commit") [C.P.](# "Chris Palmer") Added LIPO fuel gauge PCB.
+
+*   2021-06-08 [`b8efa11`](https://github.com/nophead/NopSCADlib/commit/b8efa11fd9504f4b837be663190d238c6227941e "show commit") [C.P.](# "Chris Palmer") Added SMD capacitors.
+
+*   2021-06-07 [`3bc8f35`](https://github.com/nophead/NopSCADlib/commit/3bc8f35e37741ef12d45951546059902b472b34a "show commit") [C.P.](# "Chris Palmer") Can now put `jst_ph` connectors on PCBs
+
+*   2021-06-07 [`39c11ef`](https://github.com/nophead/NopSCADlib/commit/39c11ef3b209256be393b3b211fef72c8ac793a1 "show commit") [C.P.](# "Chris Palmer") Added 2p54joiner to represent cropped headers joining PCBs.
+
+*   2021-06-07 [`5a8a1da`](https://github.com/nophead/NopSCADlib/commit/5a8a1da8801e3d799b7e322b397b236685552f97 "show commit") [C.P.](# "Chris Palmer") Added Seeeduino XIAO.
+Tiny PCBs now shown in a third line.
+
+*   2021-06-07 [`3147862`](https://github.com/nophead/NopSCADlib/commit/3147862212d6d1277a5e164909e4004e3e321f10 "show commit") [C.P.](# "Chris Palmer") PCB lands can be rounded and can specify colour.
+Holes can be positioned on the edge to make surface mountable connections.
+
+#### [v15.17.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.17.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.17.0...v15.17.1 "diff with v15.17.0")
+*   2021-06-07 [`4fc8a7f`](https://github.com/nophead/NopSCADlib/commit/4fc8a7f47df9a880b8e02c9e0f1a3a63d9939c3e "show commit") [C.P.](# "Chris Palmer") Fixed z-fighting between transparent LEDs and PCB.
+
+### [v15.17.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.17.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.16.2...v15.17.0 "diff with v15.16.2")
+*   2021-06-06 [`a9ed994`](https://github.com/nophead/NopSCADlib/commit/a9ed9944c328d1fa5121ae10e4e0243bda45f001 "show commit") [C.P.](# "Chris Palmer") Added PERF70x51.
+
+*   2021-06-06 [`9cd2dbc`](https://github.com/nophead/NopSCADlib/commit/9cd2dbc3167c1d14ac1f72e5676f4154151b5638 "show commit") [C.P.](# "Chris Palmer") Added copper colour constant.
+Copper PCB pads and veroboard tracks now use copper colour.
+
+#### [v15.16.2](https://github.com/nophead/NopSCADlib/releases/tag/v15.16.2 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.16.1...v15.16.2 "diff with v15.16.1")
+*   2021-06-06 [`f3bfbbf`](https://github.com/nophead/NopSCADlib/commit/f3bfbbfcf21209fd993aa7ebc25c8d8d3c12fbd5 "show commit") [C.P.](# "Chris Palmer") Fixed Python error when top level assembly is empty.
+
+*   2021-06-06 [`baaa85f`](https://github.com/nophead/NopSCADlib/commit/baaa85ffedb1a7cdca42e01ca8f2e257438070fc "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-06-06 [`f1a49d4`](https://github.com/nophead/NopSCADlib/commit/f1a49d4e28bf063950b113c64acaa918d470767f "show commit") [C.P.](# "Chris Palmer") Better description of `pcb_grid()`.
+
+#### [v15.16.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.16.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.16.0...v15.16.1 "diff with v15.16.0")
+*   2021-06-04 [`9a4cc7e`](https://github.com/nophead/NopSCADlib/commit/9a4cc7ec42bf440e24ad3dacd88d7055736ae793 "show commit") [C.P.](# "Chris Palmer") Ziptie BOM entries no longer segregated by radius wrapped around.
+
+### [v15.16.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.16.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.15.0...v15.16.0 "diff with v15.15.0")
+*   2021-06-04 [`a782d43`](https://github.com/nophead/NopSCADlib/commit/a782d43e67f4091f44bd9018817e7263e2944477 "show commit") [C.P.](# "Chris Palmer") `bom.py` now generates `bom.csv` to allow costed BOMs to be made using a spreadsheet.
+
+### [v15.15.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.15.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.14.2...v15.15.0 "diff with v15.14.2")
+*   2021-06-03 [`823f3b9`](https://github.com/nophead/NopSCADlib/commit/823f3b936e6c33897445d3f3272b69237f013537 "show commit") [C.P.](# "Chris Palmer") Add the ability to have a target specific top level module in place of `main_assembly()`.
+
+#### [v15.14.2](https://github.com/nophead/NopSCADlib/releases/tag/v15.14.2 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.14.1...v15.14.2 "diff with v15.14.1")
+*   2021-06-02 [`749a1f0`](https://github.com/nophead/NopSCADlib/commit/749a1f0648196bd0ae47dbe93ac1b5e3a06d78cd "show commit") [C.P.](# "Chris Palmer") Fixed male thread z-fighting bug.
+
+*   2021-06-01 [`5c898df`](https://github.com/nophead/NopSCADlib/commit/5c898df2172a7e202c9e3d8c6641a0aaf95e5d48 "show commit") [C.P.](# "Chris Palmer") More readable code in `rounded_polygon`.
+
+#### [v15.14.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.14.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.14.0...v15.14.1 "diff with v15.14.0")
+*   2021-06-01 [`20d799a`](https://github.com/nophead/NopSCADlib/commit/20d799a3c115d3d32f101c4419d6e9b57c3be8c7 "show commit") [C.P.](# "Chris Palmer") `IEC_320_C14_switched_fused_inlet` now shows the correct object name in the example.
+
+### [v15.14.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.14.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.13.4...v15.14.0 "diff with v15.13.4")
+*   2021-05-31 [`2581098`](https://github.com/nophead/NopSCADlib/commit/258109811b7b7f71895340dc4b86b96d7dbc2037 "show commit") [C.P.](# "Chris Palmer") Added uppercase version of `BLCD_motors.scad`.
+
+*   2021-05-31 [`b39fd53`](https://github.com/nophead/NopSCADlib/commit/b39fd536c2841a95ab50b8a196e21ee8fc5976d1 "show commit") [C.P.](# "Chris Palmer") Removed lower case version of `bldc_motors.scad`.
+
+*   2021-05-31 [`a5a87d2`](https://github.com/nophead/NopSCADlib/commit/a5a87d260dd4bbe40a8727a4099207271918d02b "show commit") [C.P.](# "Chris Palmer") Updated images and readme.
+
+*   2021-05-30 [`00ca412`](https://github.com/nophead/NopSCADlib/commit/00ca412441c85ea1fd7082453c823445fbbdce4e "show commit") [M.B.](# "Martin Budden") Added BLDC3548 motor.
+
+*   2021-05-30 [`1e6d7f5`](https://github.com/nophead/NopSCADlib/commit/1e6d7f5dd68e64181aef019bb8bca186abb2ac68 "show commit") [M.B.](# "Martin Budden") Brushless DC motors.
+
+#### [v15.13.4](https://github.com/nophead/NopSCADlib/releases/tag/v15.13.4 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.13.3...v15.13.4 "diff with v15.13.3")
+*   2021-05-30 [`ec07d95`](https://github.com/nophead/NopSCADlib/commit/ec07d95657d52aab375b3b2acb95c87b369d2194 "show commit") [M.B.](# "Martin Budden") Added assertion to check colour format in module thread.
+
+#### [v15.13.3](https://github.com/nophead/NopSCADlib/releases/tag/v15.13.3 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.13.2...v15.13.3 "diff with v15.13.2")
+*   2021-05-19 [`0dab0dc`](https://github.com/nophead/NopSCADlib/commit/0dab0dca08485d1717ee516a61831fcd6963e335 "show commit") [C.P.](# "Chris Palmer") Added missing includes `core.scad` which generates warnings with latest OpenSCAD snapshots.
+
+ * Note, however, NopSCADlib does not work with the current OpenSCAD snapshot.
+
+#### [v15.13.2](https://github.com/nophead/NopSCADlib/releases/tag/v15.13.2 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.13.1...v15.13.2 "diff with v15.13.1")
+*   2021-05-15 [`9689683`](https://github.com/nophead/NopSCADlib/commit/9689683b7efbde882c057a903dd7fa018107d029 "show commit") [M.B.](# "Martin Budden") Typo in `global_defs`.
+
+#### [v15.13.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.13.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.13.0...v15.13.1 "diff with v15.13.0")
+*   2021-05-18 [`11ebe22`](https://github.com/nophead/NopSCADlib/commit/11ebe2225db09bdd45089e4ebf5c1037243bf45c "show commit") [C.P.](# "Chris Palmer") Removed spurious convexity in difference from `rounded_polygon()`.
+
+### [v15.13.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.13.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.12.0...v15.13.0 "diff with v15.12.0")
+*   2021-05-02 [`3401919`](https://github.com/nophead/NopSCADlib/commit/34019196cdac6b08e57d773e138a22394b609ea5 "show commit") [C.P.](# "Chris Palmer") Updated readme
+
+*   2021-05-02 [`436fc71`](https://github.com/nophead/NopSCADlib/commit/436fc71cf319c1e71b6cbd240b76d7cad5ecd8ba "show commit") [M.B.](# "Martin Budden") Added `blower_size` function.
+
+### [v15.12.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.12.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.11.1...v15.12.0 "diff with v15.11.1")
+*   2021-04-26 [`e2feceb`](https://github.com/nophead/NopSCADlib/commit/e2feceb608b4491424c0e4c1e7c191f7d8aeceec "show commit") [C.P.](# "Chris Palmer") Updated readme
+
+*   2021-04-25 [`9c1a9bf`](https://github.com/nophead/NopSCADlib/commit/9c1a9bf3572c07a57b5bd1fde1d9a4aba14e5ea8 "show commit") [M.B.](# "Martin Budden") Add facility to orient `core_xy` with left motor being lower or upper motor.
+
+#### [v15.11.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.11.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.11.0...v15.11.1 "diff with v15.11.0")
+*   2021-04-25 [`feec1e7`](https://github.com/nophead/NopSCADlib/commit/feec1e7ae5a5217586e0ab9e7b002e8af8f7c749 "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-04-25 [`be76af2`](https://github.com/nophead/NopSCADlib/commit/be76af2fc490e10e4dd115a56019e33005f87db9 "show commit") [M.B.](# "Martin Budden") Fixed typo in `leadnut.scad`.
+
+### [v15.11.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.11.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.10.1...v15.11.0 "diff with v15.10.1")
+*   2021-04-25 [`49fdfea`](https://github.com/nophead/NopSCADlib/commit/49fdfea7926d677b6e0a9eee2fbd928f2935e1eb "show commit") [C.P.](# "Chris Palmer") Added 35BYGHJ75 geared stepper.
+
+#### [v15.10.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.10.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.10.0...v15.10.1 "diff with v15.10.0")
+*   2021-04-25 [`ac0bacf`](https://github.com/nophead/NopSCADlib/commit/ac0bacfeda43af62256e7bd3184df695b3e01d37 "show commit") [C.P.](# "Chris Palmer") Removed echo in rails test.
+
+### [v15.10.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.10.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.9.0...v15.10.0 "diff with v15.9.0")
+*   2021-04-13 [`e379fa8`](https://github.com/nophead/NopSCADlib/commit/e379fa8ada4a4089fc24ce5fc2c140a2531e2e95 "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-04-13 [`5fbff06`](https://github.com/nophead/NopSCADlib/commit/5fbff060b019a983eba93eb8c5b16adfb6a3f7ee "show commit") [M.B.](# "Martin Budden") Added a `pcb_component` function.
+
+### [v15.9.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.9.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.8.0...v15.9.0 "diff with v15.8.0")
+*   2021-04-13 [`edc0b86`](https://github.com/nophead/NopSCADlib/commit/edc0b86bb1cd52e90fe353c4aea9539e95aa5aee "show commit") [C.P.](# "Chris Palmer") Updated images and readme.
+
+*   2021-03-31 [`b70c2f9`](https://github.com/nophead/NopSCADlib/commit/b70c2f993c351bf71da57cfc169ed02a235cf4f3 "show commit") [M.B.](# "Martin Budden") Added box sections.
+
+### [v15.8.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.8.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.7.0...v15.8.0 "diff with v15.7.0")
+*   2021-04-12 [`145c5d9`](https://github.com/nophead/NopSCADlib/commit/145c5d9b1a7c873940abf266a321edabdff3b7a0 "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-04-12 [`1efed64`](https://github.com/nophead/NopSCADlib/commit/1efed649cf54607b9d39d4b7f422dd385ccb441f "show commit") [M.B.](# "Martin Budden") Added PSU size function.
+
+### [v15.7.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.7.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.6.1...v15.7.0 "diff with v15.6.1")
+*   2021-04-12 [`3f31607`](https://github.com/nophead/NopSCADlib/commit/3f31607840d162f63d12eb2317d2f28af1ecf492 "show commit") [C.P.](# "Chris Palmer") Added No8 screws.
+
+#### [v15.6.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.6.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.6.0...v15.6.1 "diff with v15.6.0")
+*   2021-04-05 [`f12b36e`](https://github.com/nophead/NopSCADlib/commit/f12b36ea046b5a784dd81b3c4e95eaf4cf24a58d "show commit") [C.P.](# "Chris Palmer") Corrected MGN12 rail end value.
+Added assert for rail end value too big.
+
+### [v15.6.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.6.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.5.0...v15.6.0 "diff with v15.5.0")
+*   2021-04-03 [`51cc2fd`](https://github.com/nophead/NopSCADlib/commit/51cc2fd6791065e1c94c761abf7dac0271e6ab28 "show commit") [C.P.](# "Chris Palmer") Carriages now appear on the BOM and both variants are shown in the rail test.
+
+*   2021-03-31 [`608168d`](https://github.com/nophead/NopSCADlib/commit/608168de8e56bfdde5ba605d27baca1900895926 "show commit") [M.B.](# "Martin Budden") Added MGN7H and MGN9H carriages.
+
+### [v15.5.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.5.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.4.0...v15.5.0 "diff with v15.4.0")
+*   2021-04-02 [`cc794cd`](https://github.com/nophead/NopSCADlib/commit/cc794cd7c3cd3e3f63d15ebbe5dabb773812ae72 "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-03-31 [`fc45a40`](https://github.com/nophead/NopSCADlib/commit/fc45a40bd3c3b524d9edc226952482296e776831 "show commit") [M.B.](# "Martin Budden") Added translated children to pulley.
+
 ### [v15.4.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.4.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.3.1...v15.4.0 "diff with v15.3.1")
 *   2021-04-02 [`b2d712b`](https://github.com/nophead/NopSCADlib/commit/b2d712bca94165a338e5f904880d12f9c4c5ecd0 "show commit") [C.P.](# "Chris Palmer") Added `quadratic_real_roots()` and `cubic_real_roots()`.
 
@@ -58,7 +281,7 @@ Breaking change in `belt_length();` now requires a type argument
 
 ## [v14.0.0](https://github.com/nophead/NopSCADlib/releases/tag/v14.0.0 "show release") Breaking Changes [...](https://github.com/nophead/NopSCADlib/compare/v13.5.0...v14.0.0 "diff with v13.5.0")
 *   2021-03-06 [`298d1f9`](https://github.com/nophead/NopSCADlib/commit/298d1f92841f30e13b437c6770fc113954b94108 "show commit") [C.P.](# "Chris Palmer") Interface is the same but filenames to be included or used changed.
-Changlog upated.
+Changelog updated.
 
 *   2021-03-06 [`491c3b4`](https://github.com/nophead/NopSCADlib/commit/491c3b4ea8d2ef51e55fd389f0dc0b9a6b9bd9a4 "show commit") [C.P.](# "Chris Palmer") Updated readme, `lib.scad` and image.
 
@@ -94,7 +317,7 @@ Changlog upated.
 
 *   2021-03-03 [`614e5f3`](https://github.com/nophead/NopSCADlib/commit/614e5f3a72db309a3dee996d7241317556883e8d "show commit") [C.P.](# "Chris Palmer") Issues in the changelog now link to to the issue.
 
-*   2021-03-03 [`a7eae4f`](https://github.com/nophead/NopSCADlib/commit/a7eae4f549b51dbe4624a8b67012919cef6cb24a "show commit") [C.P.](# "Chris Palmer") Neater changlog format.
+*   2021-03-03 [`a7eae4f`](https://github.com/nophead/NopSCADlib/commit/a7eae4f549b51dbe4624a8b67012919cef6cb24a "show commit") [C.P.](# "Chris Palmer") Neater changelog format.
 
 *   2021-03-03 [`31ab856`](https://github.com/nophead/NopSCADlib/commit/31ab8562a783464f93812b8c7c45d403587efd0a "show commit") [C.P.](# "Chris Palmer") Updated images
 
@@ -117,7 +340,7 @@ Changlog upated.
 *   2021-02-20 [`03a0c2f`](https://github.com/nophead/NopSCADlib/commit/03a0c2fe981ce12cda51a693f69b4fb19696cb8a "show commit") [C.P.](# "Chris Palmer") Fixed typo.
 
 ### [v13.3.0](https://github.com/nophead/NopSCADlib/releases/tag/v13.3.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v13.2.0...v13.3.0 "diff with v13.2.0")
-*   2021-02-20 [`7c2df8d`](https://github.com/nophead/NopSCADlib/commit/7c2df8d36d214a8bf8ebdcd39da293209bc175ab "show commit") [C.P.](# "Chris Palmer") The pose module can now specify the camera distance supressing viewall and
+*   2021-02-20 [`7c2df8d`](https://github.com/nophead/NopSCADlib/commit/7c2df8d36d214a8bf8ebdcd39da293209bc175ab "show commit") [C.P.](# "Chris Palmer") The pose module can now specify the camera distance suppressing viewall and
 autocentre.
 
 ### [v13.2.0](https://github.com/nophead/NopSCADlib/releases/tag/v13.2.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v13.1.0...v13.2.0 "diff with v13.1.0")
@@ -412,9 +635,9 @@ Updated pics and readme.
 *   2020-12-28 [`ba586b3`](https://github.com/nophead/NopSCADlib/commit/ba586b368582db163af143ebb60afed270f77b1c "show commit") [C.P.](# "Chris Palmer") Example images update to match new contersink screws and teardrops.
 
 ### [v10.21.0](https://github.com/nophead/NopSCADlib/releases/tag/v10.21.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v10.20.1...v10.21.0 "diff with v10.20.1")
-*   2020-12-28 [`8d22940`](https://github.com/nophead/NopSCADlib/commit/8d22940506df525ac52ef6f8a00ea03661f3b682 "show commit") [C.P.](# "Chris Palmer") Project blurb can now be split with into sections with markdown horizonal rules
+*   2020-12-28 [`8d22940`](https://github.com/nophead/NopSCADlib/commit/8d22940506df525ac52ef6f8a00ea03661f3b682 "show commit") [C.P.](# "Chris Palmer") Project blurb can now be split with into sections with markdown horizontal rules
 made with asterisks.
-If an image is include in the first section the default image is supressed.
+If an image is include in the first section the default image is suppressed.
 
 #### [v10.20.1](https://github.com/nophead/NopSCADlib/releases/tag/v10.20.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v10.20.0...v10.20.1 "diff with v10.20.0")
 *   2020-12-26 [`87c8bbb`](https://github.com/nophead/NopSCADlib/commit/87c8bbb9a549aabb84004426332dc964583472c5 "show commit") [M.B.](# "Martin Budden") Fixed error in `carriage_size` function.
@@ -429,12 +652,12 @@ If an image is include in the first section the default image is supressed.
 
 ### [v10.20.0](https://github.com/nophead/NopSCADlib/releases/tag/v10.20.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v10.19.0...v10.20.0 "diff with v10.19.0")
 *   2020-12-24 [`6f8ff60`](https://github.com/nophead/NopSCADlib/commit/6f8ff606fa5b2ef7d81fb687b77bd6236f6d277f "show commit") [C.P.](# "Chris Palmer") Removed `woven_sheet()` from the readme.
-Removed redundent code.
+Removed redundant code.
 
 *   2020-12-24 [`acd5de0`](https://github.com/nophead/NopSCADlib/commit/acd5de0fbd513b67387478b4c89a5ef4f11b440b "show commit") [C.P.](# "Chris Palmer") Fixed extra BOM entries for woven sheet.
 Added render colour to BOM for 3D sheets.
 
-*   2020-12-23 [`cc1e3ba`](https://github.com/nophead/NopSCADlib/commit/cc1e3baaf6ba7451b3545efc949015af822dc95c "show commit") [C.P.](# "Chris Palmer") Reimplemeted woven sheets with an eye to speed and interface consistancy.
+*   2020-12-23 [`cc1e3ba`](https://github.com/nophead/NopSCADlib/commit/cc1e3baaf6ba7451b3545efc949015af822dc95c "show commit") [C.P.](# "Chris Palmer") Reimplemeted woven sheets with an eye to speed and interface consistency.
 
 *   2020-12-13 [`85cb54e`](https://github.com/nophead/NopSCADlib/commit/85cb54ef318597a4922077785247ddcb08d5e00d "show commit") [M.B.](# "Martin Budden") Added sheet with checkerboard texture to simulate carbon fiber.
 
@@ -899,7 +1122,7 @@ Done to reduced the number of global constants.
 `Panel_meters` can now have inner apertures and buttons.
 
 ### [v7.2.0](https://github.com/nophead/NopSCADlib/releases/tag/v7.2.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v7.1.1...v7.2.0 "diff with v7.1.1")
-*   2020-05-02 [`baa737c`](https://github.com/nophead/NopSCADlib/commit/baa737c4d83be0ab38685122ebe535872fe63e20 "show commit") [C.P.](# "Chris Palmer") Updated example to use Foot contructor.
+*   2020-05-02 [`baa737c`](https://github.com/nophead/NopSCADlib/commit/baa737c4d83be0ab38685122ebe535872fe63e20 "show commit") [C.P.](# "Chris Palmer") Updated example to use Foot constructor.
 
 *   2020-05-02 [`70b13d2`](https://github.com/nophead/NopSCADlib/commit/70b13d2f2723caa18a69afb7a179d88366c82c51 "show commit") [C.P.](# "Chris Palmer") Added functions to create property lists that are created by the client.
 Foot, box, bbox, pbox, `flat_hinge` and `strap_handle`.
@@ -1103,7 +1326,7 @@ The implementation files are still lower case for backwards compatibility.
 
 *   2020-03-03 [`bd60b50`](https://github.com/nophead/NopSCADlib/commit/bd60b50b099d76f6588ddfe900be276ed7d0cf98 "show commit") [C.P.](# "Chris Palmer") Removed lower case tests
 
-*   2020-03-03 [`4d51cb7`](https://github.com/nophead/NopSCADlib/commit/4d51cb73f3d2b3a92ac4c12a2002bc4918228969 "show commit") [C.P.](# "Chris Palmer") Table of contents now has three vitamin coloumns
+*   2020-03-03 [`4d51cb7`](https://github.com/nophead/NopSCADlib/commit/4d51cb73f3d2b3a92ac4c12a2002bc4918228969 "show commit") [C.P.](# "Chris Palmer") Table of contents now has three vitamin columns
 
 *   2020-03-02 [`3b77c97`](https://github.com/nophead/NopSCADlib/commit/3b77c975325851caf5e602ae6ceaa8e5d9126425 "show commit") [C.P.](# "Chris Palmer") Example now include `core.scad` instead of `lib.scad`.
 
@@ -1380,7 +1603,7 @@ This means 5mm, 6mm etc comes before 10mm in BOM.
 
 *   2020-01-11 [`d1324a6`](https://github.com/nophead/NopSCADlib/commit/d1324a670eb7ec898e6663dc9394fc1bd19ef664 "show commit") [M.B.](# "Martin Budden") Added JST-XH connector for pcbs.
 
-*   2020-02-22 [`599fbba`](https://github.com/nophead/NopSCADlib/commit/599fbba6c2b036a4a22fa04f2e06f67ef5bb9578 "show commit") [C.P.](# "Chris Palmer") Reduced dependecies in `pcb_mount` test.
+*   2020-02-22 [`599fbba`](https://github.com/nophead/NopSCADlib/commit/599fbba6c2b036a4a22fa04f2e06f67ef5bb9578 "show commit") [C.P.](# "Chris Palmer") Reduced dependencies in `pcb_mount` test.
 
 ### [v2.19.0](https://github.com/nophead/NopSCADlib/releases/tag/v2.19.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v2.16.0...v2.19.0 "diff with v2.16.0")
 *   2020-02-22 [`6097e07`](https://github.com/nophead/NopSCADlib/commit/6097e0709498166c61712094fcc11f083e25959f "show commit") [C.P.](# "Chris Palmer") Updated images and readme.
@@ -1696,7 +1919,7 @@ IEC screw length fixed at 10 if inserts used.
 *   2019-06-14 [`a51e96e`](https://github.com/nophead/NopSCADlib/commit/a51e96ec433c6d347e0d313573585cda9978e7b4 "show commit") [C.P.](# "Chris Palmer") Nuts now show their thickness on the BOM so half nuts have a different description.
 
 ## [v1.0.0](https://github.com/nophead/NopSCADlib/releases/tag/v1.0.0 "show release") Breaking Changes [...](https://github.com/nophead/NopSCADlib/compare/v0.0.1...v1.0.0 "diff with v0.0.1")
-*   2019-06-14 [`b719601`](https://github.com/nophead/NopSCADlib/commit/b719601a645d899f5477c13a34f857d178bcc3a1 "show commit") [C.P.](# "Chris Palmer") Fixed cable strip parameters and BOM desciption
+*   2019-06-14 [`b719601`](https://github.com/nophead/NopSCADlib/commit/b719601a645d899f5477c13a34f857d178bcc3a1 "show commit") [C.P.](# "Chris Palmer") Fixed cable strip parameters and BOM description
 
 #### [v0.0.1](https://github.com/nophead/NopSCADlib/releases/tag/v0.0.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v0.0.0...v0.0.1 "diff with v0.0.0")
 *   2019-06-14 [`5ede2d0`](https://github.com/nophead/NopSCADlib/commit/5ede2d0895a8a813ef2bc47bf94462d668bc440b "show commit") [C.P.](# "Chris Palmer") Smooth pulleys now show their OD on the BOM.

docs/usage.md

@@ -270,6 +270,22 @@ The target config file is selected by generating `target.scad` that includes `co
 The rest of the project includes `target.scad` to use the configuration.
 Additionally all the generated file directories (assemblies, bom, stls, dxfs, etc.) are placed in a sub-directory called `<target_name>`.
 
+The build system will look for a `<target_name>_assembly` module and use it as the top level module instead of `main_assembly` if it it exists.
+That allows the project description to be target specific if the top level modules are in different scad files.
+The top level assembly instructions and assembly contents could also be different if appropriate.
+
+If the top level module is just a shell wrapper that simply includes one other assembly, with no additional parts, then it is removed from the build instructions and
+the assembly it calls becomes the top level. This allows a different project description for each target but only one set of top level instructions without repeating them.
+
+### Costed BOMs
+
+A costed bill of materials can be made by opening the generated file `bom/bom.csv` in a spreadsheet program using a single quote as the string delimiter and comma as the field separator.
+That gets a list of part descriptions and quantities to which prices can be added to get the total cost and perhaps a URL of where to buy each part.
+
+If a Python file called `parts.py` is found then `bom.py` will attempt to call functions for each part to get a price and URL.
+Any functions not found are printed, so you can see the format expected.
+The function are passed the quantity to allow them to calculate volume discounts, etc.
+
 ### Other libraries
 
 The build scripts need to be able to locate the source files where the modules to generate the STL files and assemblies reside. They will search all the scad files

examples/MainsBreakOutBox/bom/bom.csv

@@ -0,0 +1,16 @@
+'Ferrule for 1.5mm^2 wire - not shown',  3
+'Wire blue 30/0.25mm strands, length 150mm - not shown',  2
+'Wire brown 30/0.25mm strands, length 150mm - not shown',  2
+'Wire green & yellow 30/0.25mm strands, length 150mm - not shown',  2
+'IEC inlet for ATX',  1
+'Heatfit insert M3',  2
+'4mm shielded jack socket blue',  2
+'4mm shielded jack socket brown',  1
+'4mm shielded jack socket green',  2
+'Mains socket 13A',  1
+'Nut M3 x 2.4mm nyloc',  6
+'Screw M3 cs cap x 12mm',  2
+'Screw M3 cs cap x 20mm',  2
+'Screw M3 dome x 10mm',  4
+'Heatshrink sleeving ID 3.2mm x 15mm - not shown',  8
+'Washer  M3 x 7mm x 0.5mm', 10

global_defs.scad

@@ -24,18 +24,16 @@
 //  bom defaults to 0
 //  Setting $bom on the command line or in the main file before including lib.scad overrides it everywhere.
 //  Setting $bom after including lib overrides bom in the libs but not in the local file.
-//  Setting $_bom in the local file overrides it in the local file but not in the libs.
 //
 rr_green = [0, 146/255, 0];                                               // RepRap logo colour
+crimson  = [220/255, 20/255, 60/255];
 
-$_bom           = is_undef($bom)             ? 0      : $bom;             // 0 no bom, 1 assemblies and stls, 2 vitamins as well
-$exploded       = is_undef($explode)         ? 0      : $explode;         // 1 for exploded view
-layer_height    = is_undef($layer_height)    ? 0.25   : $layer_height;    // layer heigth when printing
+layer_height    = is_undef($layer_height)    ? 0.25   : $layer_height;    // layer height when printing
 extrusion_width = is_undef($extrusion_width) ? 0.5    : $extrusion_width; // filament width when printing
 nozzle          = is_undef($nozzle)          ? 0.45   : $nozzle;          // 3D printer nozzle
 cnc_bit_r       = is_undef($cnc_bit_r)       ? 1.2    : $cnc_bit_r;       // minimum tool radius when milling 2D objects
 pp1_colour      = is_undef($pp1_colour)      ? rr_green : $pp1_colour;    // printed part colour 1, RepRap logo colour
-pp2_colour      = is_undef($pp2_colour)      ? "Crimson"  : $pp2_colour;  // printed part colour 2
+pp2_colour      = is_undef($pp2_colour)      ? crimson : $pp2_colour;     // printed part colour 2
 pp3_colour      = is_undef($pp3_colour)      ? "SteelBlue" : $pp3_colour; // printed part colour 3
 pp4_colour      = is_undef($pp4_colour)      ? "darkorange" : $pp4_colour;// printed part colour 4
 show_rays       = is_undef($show_rays)       ? false  : $show_rays;       // show camera sight lines and light direction
@@ -53,9 +51,10 @@ $fs = extrusion_width / 2;
 function round_to_layer(z) = ceil(z / layer_height) * layer_height;
 // Some additional named colours
 function grey(n) = [0.01, 0.01, 0.01] * n;                                          //! Generate a shade of grey to pass to color().
-gold                            = [255/255, 215/255, 0/255];
-brass                           = [255/255, 220/255, 100/255];
 silver                          = [0.75, 0.75, 0.75];
+gold                            = [255, 215,   0] / 255;
+brass                           = [255, 220, 100] / 255;
+copper                          = [230, 140,  51] / 255;
 
 /*
  * Enums

lib.scad

@@ -28,6 +28,8 @@ include <vitamins/pcbs.scad>
 include <vitamins/batteries.scad>
 include <vitamins/bearing_blocks.scad>
 include <vitamins/blowers.scad>
+include <vitamins/bldc_motors.scad>
+include <vitamins/box_sections.scad>
 include <vitamins/bulldogs.scad>
 include <vitamins/buttons.scad>
 include <vitamins/cameras.scad>
@@ -53,6 +55,7 @@ include <vitamins/pulleys.scad>
 include <vitamins/ring_terminals.scad>
 include <vitamins/rails.scad>
 include <vitamins/rod.scad>
+include <vitamins/servo_motors.scad>
 include <vitamins/shaft_couplings.scad>
 include <vitamins/sheets.scad>
 include <vitamins/sk_brackets.scad>

libtest.scad

@@ -41,11 +41,14 @@
 //
 include <lib.scad>
 
+use <tests/7_segments.scad>
 use <tests/ball_bearings.scad>
 use <tests/batteries.scad>
 use <tests/bearing_blocks.scad>
 use <tests/belts.scad>
+use <tests/BLDC_motors.scad>
 use <tests/blowers.scad>
+use <tests/box_sections.scad>
 use <tests/bulldogs.scad>
 use <tests/buttons.scad>
 use <tests/cable_strips.scad>
@@ -81,6 +84,7 @@ use <tests/panel_meters.scad>
 use <tests/PCBs.scad>
 use <tests/pillars.scad>
 use <tests/pillow_blocks.scad>
+use <tests/potentiometers.scad>
 use <tests/press_fit.scad>
 use <tests/PSUs.scad>
 use <tests/pulleys.scad>
@@ -90,6 +94,7 @@ use <tests/rockers.scad>
 use <tests/rod.scad>
 use <tests/screws.scad>
 use <tests/sealing_strip.scad>
+use <tests/servo_motors.scad>
 use <tests/shaft_couplings.scad>
 use <tests/sheets.scad>
 use <tests/SK_brackets.scad>
@@ -183,16 +188,15 @@ translate([x5, cable_grommets_y + 250])
 translate([950, 600])
     box_test();
 
-translate([830, 770])
+translate([900, 750])
     pocket_handles();
 
-translate([950, 750])
+translate([900, 850])
     printed_boxes();
 
-translate([850, 1330])
+translate([850, 1330 + 85])
     bbox_test();
 
-
 inserts_y = 0;
 nuts_y = inserts_y + 20;
 washers_y = nuts_y + 120;
@@ -204,13 +208,14 @@ sealing_strip_y = springs_y + 20;
 tubings_y = sealing_strip_y + 20;
 pillars_y = tubings_y + 20;
 ball_bearings_y = pillars_y + 40;
-pulleys_y = ball_bearings_y +40;
-hot_ends_y = pulleys_y + 60;
-linear_bearings_y = hot_ends_y + 50;
-sheets_y = linear_bearings_y + 90;
+pulleys_y = ball_bearings_y + 40;
+leadnuts_y = pulleys_y + 60;
+linear_bearings_y = leadnuts_y + 50;
+steppers_y = linear_bearings_y + 110;
+sheets_y = steppers_y + 55;
 pcbs_y = sheets_y + 60;
-displays_y = pcbs_y + 170;
-fans_y = displays_y + 80;
+displays_y = pcbs_y + 140;
+fans_y = displays_y + 110;
 transformers_y = fans_y + 120;
 psus_y = transformers_y + 190;
 
@@ -253,13 +258,16 @@ translate([x0, ball_bearings_y])
 translate([x0, pulleys_y])
     pulleys();
 
+translate([x0, leadnuts_y])
+    leadnuts();
+
 translate([x0, linear_bearings_y]) {
     linear_bearings();
     rods();
 }
 
-translate([x0 + 10, hot_ends_y])
-    hot_ends();
+translate([x0, steppers_y])
+    stepper_motors();
 
 translate([x0, sheets_y])
     sheets();
@@ -277,7 +285,7 @@ translate([x0, fans_y]) {
         fan_guards();
 }
 
-translate([x0, transformers_y])
+translate([760, fans_y])
     variacs();
 
 translate([x0, psus_y]) {
@@ -289,7 +297,6 @@ translate([x0, psus_y]) {
 zipties_y = 0;
 bulldogs_y = zipties_y + 30;
 swiss_clips_y = bulldogs_y + 35;
-leadnuts_y = swiss_clips_y + 50;
 
 translate([x1, zipties_y])
     zipties();
@@ -300,10 +307,6 @@ translate([x1, bulldogs_y])
 translate([x1, swiss_clips_y])
     swiss_clips();
 
-translate([x1, leadnuts_y])
-    leadnuts();
-
-
 leds_y = 0;
 carriers_y = leds_y + 40;
 magnets_y = carriers_y + 40;
@@ -360,18 +363,18 @@ iecs_y = d_connectors_y + 80;
 modules_y = iecs_y + 60;
 ssrs_y = modules_y + 80;
 blowers_y = ssrs_y + 60;
-batteries_y = blowers_y + 100;
-steppers_y = batteries_y + 55;
-panel_meters_y = steppers_y + 70;
+hot_ends_y = blowers_y + 100;
+batteries_y = hot_ends_y + 55;
+panel_meters_y = batteries_y + 70;
 extrusions_y = panel_meters_y + 80;
 
 translate([x3, veroboard_y])
     veroboard_test();
 
-translate([x3 + 70, veroboard_y + 30])
+translate([x3 + 60, veroboard_y + 20])
     geared_steppers();
 
-translate([x3 + 140, veroboard_y + 20])
+translate([x3 + 160, ssrs_y])
     pcb_mounts();
 
 translate([x3 + 170, veroboard_y + 16])
@@ -407,8 +410,8 @@ translate([x3, blowers_y])
 translate([x3, batteries_y])
     batteries();
 
-translate([x2, steppers_y])  // interloper
-    stepper_motors();
+translate([x3 + 10, hot_ends_y])
+    hot_ends();
 
 translate([x2, panel_meters_y])
     panel_meters();
@@ -416,7 +419,7 @@ translate([x2, panel_meters_y])
 translate([x2, extrusions_y])
     extrusions();
 
-translate([x3, transformers_y])
+translate([400, transformers_y])
     transformers();
 
 
@@ -424,15 +427,21 @@ belts_y = 0;
 rails_y = belts_y + 200;
 extrusion_brackets_y = rails_y + 250;
 sk_brackets_y = extrusion_brackets_y + 80;
-kp_pillow_blocks_y = sk_brackets_y + 50;
+kp_pillow_blocks_y = sk_brackets_y + 60;
 scs_bearing_blocks_y = kp_pillow_blocks_y + 60;
+box_sections_y = batteries_y;
+BLDC_y = scs_bearing_blocks_y + 120;
+pot_y = BLDC_y + 40;
+cable_strip_y = pot_y + 50;
+
+translate([0, transformers_y])
+    servo_motors();
 
 translate([x4 + 200, belts_y + 58]) {
     belt_test();
 
     translate([0, 60])
         opengrab_test();
-
 }
 
 translate([x4 + 175, belts_y, -20])
@@ -441,7 +450,7 @@ translate([x4 + 175, belts_y, -20])
 translate([x4, rails_y + 130])
     rails();
 
-translate([770, fans_y + 50])
+translate([x4, cable_strip_y])
     cable_strips();
 
 translate([x4, kp_pillow_blocks_y])
@@ -453,12 +462,20 @@ translate([x4, sk_brackets_y])
 translate([x4, extrusion_brackets_y])
     extrusion_brackets();
 
-translate([x4 + 120, extrusion_brackets_y])
+translate([x1, swiss_clips_y + 50])
     shaft_couplings();
 
 translate([x4, scs_bearing_blocks_y])
     scs_bearing_blocks();
 
+translate([x4, BLDC_y])
+    bldc_motors();
+
+translate([x4, pot_y])
+    potentiometers();
+
+translate([x2, box_sections_y])
+    box_sections();
 
 translate([x6, 125])
     light_strips();

printed/butt_box.scad

@@ -54,7 +54,7 @@ function bbox(screw, sheets, base_sheet, top_sheet, span, size, name = "bbox", s
  [ screw, sheets, base_sheet, top_sheet, span, size.x, size.y, size.z, name, skip_blocks, star_washers ];
 
 function bbox_volume(type) = bbox_width(type) * bbox_depth(type) * bbox_height(type) / 1000000; //! Internal volume in litres
-function bbox_area(type) = let(w =  bbox_width(type), d = bbox_depth(type), h = bbox_height(type)) //! Internal surdface area in m^2
+function bbox_area(type) = let(w =  bbox_width(type), d = bbox_depth(type), h = bbox_height(type)) //! Internal surface area in m^2
     2 * (w * d + w * h + d * h) / 1000000;
 
 module bbox_shelf_blank(type) { //! 2D template for a shelf

printed/door_hinge.scad

@@ -45,7 +45,7 @@ function door_hinge_stat_screw() = stat_screw;              //! Screw use to fas
 function door_hinge_stat_width() = stat_width;              //! Width of the stationary part
 function door_hinge_stat_length() = stat_length;            //! Length of the stationary part
 
-module door_hinge_hole_positions(dir = 0) {                 //! Position chidren at the door hole positions
+module door_hinge_hole_positions(dir = 0) {                 //! Position children at the door hole positions
     hole_pitch = width - 10;
 
     for(side = [-1, 1])

printed/door_latch.scad

@@ -57,7 +57,7 @@ module door_latch_stl() { //! Generates the STL for the printed part
         }
 }
 
-module door_latch_assembly(sheet_thickness = 3) { //! The assembly for a specified sheet thickess
+module door_latch_assembly(sheet_thickness = 3) { //! The assembly for a specified sheet thickness
     washer = screw_washer(screw);
     nut = screw_nut(screw);
 

printed/drag_chain.scad

@@ -20,7 +20,7 @@
 //
 //! Parametric cable drag chain to limit the bend radius of a cable run.
 //!
-//! Each link has a maximum bend angle of 45°, so the mininium radius is proportional to the link length.
+//! Each link has a maximum bend angle of 45°, so the minimum radius is proportional to the link length.
 //!
 //! The travel property is how far it can move in each direction, i.e. half the maximum travel if the chain is mounted in the middle of the travel.
 //!

printed/fan_guard.scad

@@ -17,7 +17,7 @@
 // If not, see <https://www.gnu.org/licenses/>.
 
 //
-//! Pintable fan finger guard to match the specified fan. To be `include`d, not `use`d.
+//! Printable fan finger guard to match the specified fan. To be `include`d, not `use`d.
 //!
 //! The ring spacing as well as the number of spokes can be specified, if zero a gasket is generated instead of a guard.
 //

printed/flat_hinge.scad

@@ -40,7 +40,7 @@ function hinge_knuckles(type)    = type[6]; //! How many knuckles
 function hinge_screw(type)       = type[7]; //! Screw type to mount it
 function hinge_screws(type)      = type[8]; //! How many screws
 function hinge_clearance(type)   = type[9]; //! Clearance between knuckles
-function hinge_margin(type)      = type[10]; //! How far to keep the screws from the knuckes
+function hinge_margin(type)      = type[10]; //! How far to keep the screws from the knuckles
 
 function flat_hinge(name, size, pin_d, knuckle_d, knuckles, screw, screws, clearance, margin) = //! Construct the property list for a flat hinge.
  [name, size.x, size.y, size.z, pin_d, knuckle_d, knuckles, screw, screws, clearance, margin];
@@ -73,7 +73,7 @@ module hinge_male(type, female = false) {       //! The half with the stationary
     assert(kr > pr, "knuckle diameter must be bigger than the pin diameter");
 
     n = hinge_knuckles(type);
-    assert(n >= 3, "must be at least three knuckes");
+    assert(n >= 3, "must be at least three knuckles");
     mn = ceil(n / 2);                           // Male knuckles
     fn = floor(n / 2);                          // Female knuckles
     gap = hinge_clearance(type);

printed/psu_shroud.scad

@@ -41,6 +41,7 @@ overlap = 6;
 cable_tie_inset = wall + 4;
 
 function psu_shroud_extent(type) = 15 + wall;                                   //! How far it extends beyond the PSU to clear the connections
+function psu_shroud_wall(type) = wall;                                          //! The wall thickness
 function psu_shroud_depth(type) =                                               //! Outside depth of the shroud
     psu_left_bay(type) + overlap + psu_shroud_extent(type);
 
@@ -154,7 +155,7 @@ assembly(str("PSU_shroud_", name), ngb = true) {
             insert(insert);
 }
 
-module psu_shroud_fastened_assembly(type, cable_d, thickness, name, cables = 1) //! Assembly with screws in place
+module psu_shroud_fastened_assembly(type, cable_d, thickness, name, cables = 1, screw = screw) //! Assembly with screws in place
 {
     screw_length = screw_length(screw,thickness + counter_bore, 2, true);
 

scripts/bom.py

@@ -31,6 +31,12 @@ from set_config import *
 import json
 import re
 
+try:
+    import parts
+    got_parts_py = True
+except:
+    got_parts_py = False
+
 def find_scad_file(mname):
     for filename in os.listdir(source_dir):
         if filename[-5:] == ".scad":
@@ -46,6 +52,18 @@ def find_scad_file(mname):
                             return filename
     return None
 
+def main_assembly(target):
+    file = None
+    if target:
+        assembly = target + "_assembly"
+        file = find_scad_file(assembly)
+    if not file:
+        assembly = "main_assembly"
+        file = find_scad_file(assembly)
+    if not file:
+        raise Exception("can't find source for " + assembly)
+    return assembly, file
+
 class Part:
     def __init__(self, args):
         self.count = 1
@@ -117,6 +135,33 @@ class BOM:
             return ass
         return ass.replace("assembly", "assemblies")
 
+    def print_CSV(self,  file = None):
+        i = 0
+        for part in sorted(self.vitamins):
+            i += 1
+            if ': ' in part:
+                part_no, description = part.split(': ')
+            else:
+                part_no, description = "", part
+            qty = self.vitamins[part].count
+            if got_parts_py:
+                match = re.match(r'^.*\((.*?)[,\)].*$', part_no)
+                if match and not match.group(1).startswith('"'):
+                    part_no = part_no.replace('(' + match.group(1), '_' + match.group(1) + '(').replace('(, ', '(')
+                func = 'parts.' + part_no.replace('(', '(%d, ' % qty).replace(', )', ')')
+                func = func.replace('true',  'True').replace('false', 'False').replace('undef', 'None')
+                try:
+                    price, url = eval(func)
+                    print("'%s',%3d,%.2f,'=B%d*C%d',%s" % (description, qty, price, i, i, url), file=file)
+                except:
+                    if part_no:
+                        print("%s not found in parts.py" % func)
+                    print("'%s',%3d" % (description, qty), file=file)
+            else:
+                print("'%s',%3d" % (description, qty), file=file)
+        if got_parts_py:
+            print(",'=SUM(B1:B%d)',,'=SUM(D1:D%d)'" %(i, i), file=file)
+
     def print_bom(self, breakdown, file = None):
         if self.vitamins:
             print("Vitamins:", file=file)
@@ -221,28 +266,20 @@ def parse_bom(file = "openscad.log", name = None):
     return main
 
 def usage():
-    print("\nusage:\n\tbom [target_config] [<accessory_name>_assembly] - Generate BOMs for a project or an accessory to a project.")
+    print("\nusage:\n\tbom [target_config] - Generate BOMs for a project.")
     sys.exit(1)
 
-def boms(target = None, assembly = None):
+def boms(target = None):
     try:
         bom_dir = set_config(target, usage) + "bom"
-        if assembly:
-            bom_dir += "/accessories"
-            if not os.path.isdir(bom_dir):
-                os.makedirs(bom_dir)
-        else:
-            assembly = "main_assembly"
-            if os.path.isdir(bom_dir):
-                shutil.rmtree(bom_dir)
-                sleep(0.1)
-            os.makedirs(bom_dir)
+        if os.path.isdir(bom_dir):
+            shutil.rmtree(bom_dir)
+            sleep(0.1)
+        os.makedirs(bom_dir)
         #
-        # Find the scad file that makes the module
+        # Find the scad file that makes the main assembly
         #
-        scad_file = find_scad_file(assembly)
-        if not scad_file:
-            raise Exception("can't find source for " + assembly)
+        assembly, scad_file = main_assembly(target)
         #
         # make a file to use the module
         #
@@ -259,8 +296,9 @@ def boms(target = None, assembly = None):
 
         main = parse_bom("openscad.echo", assembly)
 
-        if assembly == "main_assembly":
-            main.print_bom(True, open(bom_dir + "/bom.txt","wt"))
+        main.print_bom(True, open(bom_dir + "/bom.txt","wt"))
+
+        main.print_CSV(open(bom_dir + "/bom.csv","wt"))
 
         for ass in main.assemblies:
             with open(bom_dir + "/" + ass + ".txt", "wt") as f:
@@ -278,20 +316,8 @@ def boms(target = None, assembly = None):
         sys.exit(1)
 
 if __name__ == '__main__':
-    if len(sys.argv) > 3: usage()
+    if len(sys.argv) > 2: usage()
 
-    if len(sys.argv) == 3:
-        target, assembly = sys.argv[1], sys.argv[2]
-    else:
-        if len(sys.argv) == 2:
-            if sys.argv[1][-9:] == "_assembly":
-                target, assembly = None, sys.argv[1]
-            else:
-                target, assembly = sys.argv[1], None
-        else:
-            target, assembly = None, None
+    target = sys.argv[1] if len(sys.argv) == 2 else None
 
-    if assembly:
-        if assembly[-9:] != "_assembly": usage()
-
-    boms(target, assembly)
+    boms(target)

scripts/changelog.py

@@ -24,6 +24,7 @@ from __future__ import print_function
 import sys
 import subprocess
 import re
+from tests import do_cmd
 
 filename = 'CHANGELOG.md'
 
@@ -162,3 +163,4 @@ if __name__ == '__main__':
 
             if not c.comment.startswith('Merge branch') and not c.comment.startswith('Merge pull') and not re.match(r'U..ated changelog.*', c.comment):
                 print('* %s [`%s`](%s "show commit") %s %s\n' % (c.date, c.hash[:7], url + '/commit/' + c.hash, initials(c.author), fixup_comment(c.comment, url)), file = file)
+    do_cmd(('codespell -w -L od ' + filename).split())

scripts/exports.py

@@ -139,6 +139,7 @@ def make_parts(target, part_type, parts = None):
                                             #
                                             part_maker_name = tmp_dir + '/' + part_type + ".scad"
                                             with open(part_maker_name, "w") as f:
+                                                f.write("include <NopSCADlib/global_defs.scad>\n")
                                                 f.write("use <%s/%s>\n" % (reltmp(dir, target), filename))
                                                 f.write("%s();\n" % module);
                                             t = time.time()

scripts/options.py

@@ -17,7 +17,7 @@
 # If not, see <https://www.gnu.org/licenses/>.
 #
 
-# Set command line options from enviroment variables and check if they have changed
+# Set command line options from environment variables and check if they have changed
 
 import json, os, deps
 from colorama import Fore, init

scripts/render.py

@@ -94,11 +94,13 @@ def render(target, type):
             cam = "--camera=0,0,0,70,0,315,500" if type == 'stl' else "--camera=0,0,0,0,0,0,500"
             render = "--preview" if type == 'stl' or colour != pp1 else "--render"
             tmp_name = tmp_dir + '/' + part[:-4] + '.png'
-            openscad.run("-o", tmp_name, png_maker_name, colour_scheme, "--projection=p", "--imgsize=4096,4096", cam, render, "--autocenter", "--viewall");
+            dummy_deps_name = tmp_dir + '/tmp.deps' # work around for OpenSCAD issue #3879
+            openscad.run("-o", tmp_name, png_maker_name, colour_scheme, "--projection=p", "--imgsize=4096,4096", cam, render, "--autocenter", "--viewall", "-d", dummy_deps_name)
             do_cmd(("magick "+ tmp_name + " -trim -resize 280x280 -background %s -gravity Center -extent 280x280 -bordercolor %s -border 10 %s"
                     % (background, background, tmp_name)).split())
             update_image(tmp_name, png_name)
             os.remove(png_maker_name)
+            os.remove(dummy_deps_name)
     #
     # Remove tmp dir
     #

scripts/tests.py

@@ -72,6 +72,8 @@ def update_image(tmp_name, png_name):
     if pixels < 0 or pixels > threshold:
         shutil.copyfile(tmp_name, png_name)
         print(Fore.YELLOW + png_name + " updated" + Fore.WHITE, pixels if pixels > 0 else '')
+        if png_name.endswith('_tn.png'):
+            os.remove(diff_name)
     else:
         os.utime(png_name, None)
         os.remove(diff_name)
@@ -173,7 +175,7 @@ def tests(tests):
                     impl_name = None
 
             if libtest:
-                vsplit = "AJR" + chr(ord('Z') + 1)
+                vsplit = "AIR" + chr(ord('Z') + 1)
                 vtype = locations[0][1]
                 types = [vtype + ' ' + vsplit[i] + '-' + chr(ord(vsplit[i + 1]) - 1) for i in range(len(vsplit) - 1)] + [loc[1] for loc in locations[1 :]]
                 if type == vtype:

scripts/tmpdir.py

@@ -25,6 +25,7 @@ import time
 def mktmpdir(top_dir):
     tmp_dir = top_dir + 'tmp'
     if not os.path.isdir(tmp_dir):
+        time.sleep(0.1)
         os.makedirs(tmp_dir)
     else:
         for file in os.listdir(tmp_dir):

scripts/views.py

@@ -77,12 +77,12 @@ def bom_to_assemblies(bom_dir, bounds_map):
     #
     if flat_bom:
         ass = flat_bom[-1]
-        if len(ass["assemblies"]) < 2 and not ass["vitamins"] and not ass["printed"] and not ass["routed"]:
+        if len(ass["assemblies"]) == 1 and not ass["vitamins"] and not ass["printed"] and not ass["routed"]:
             flat_bom = flat_bom[:-1]
     return [assembly["name"] for  assembly in flat_bom]
 
 def eop(doc_file, last = False, first = False):
-    print('<span></span>', file = doc_file)     # An invisable marker for page breaks because markdown takes much longer if the document contains a div
+    print('<span></span>', file = doc_file)     # An invisible marker for page breaks because markdown takes much longer if the document contains a div
     if not first:
         print('[Top](#TOP)', file = doc_file)
     if not last:
@@ -161,6 +161,7 @@ def views(target, do_assemblies = None):
     # Find all the scad files
     #
     main_blurb = None
+    main_assembly, main_file = bom.main_assembly(target)
     pngs = []
     for dir in source_dirs(bom_dir):
         if os.path.isdir(dir):
@@ -215,6 +216,7 @@ def views(target, do_assemblies = None):
                                                 #
                                                 png_maker_name = tmp_dir + '/png.scad'
                                                 with open(png_maker_name, "w") as f:
+                                                    f.write("include <NopSCADlib/global_defs.scad>\n")
                                                     f.write("use <%s/%s>\n" % (reltmp(dir, target), filename))
                                                     f.write("%s();\n" % module);
                                                 t = time.time()
@@ -232,7 +234,7 @@ def views(target, do_assemblies = None):
                                                 update_image(tmp_name, tn_name)
                                     done_assemblies.append(real_name)
                                 else:
-                                    if module == 'main_assembly':
+                                    if module == main_assembly:
                                         main_blurb = blurb.scrape_module_blurb(lines[:line_no])
                         line_no += 1
     #
@@ -246,9 +248,6 @@ def views(target, do_assemblies = None):
         project = ' '.join(word[0].upper() + word[1:] for word in os.path.basename(os.getcwd()).split('_'))
         print('<a name="TOP"></a>', file = doc_file)
         print('# %s' % project, file = doc_file)
-        main_file = bom.find_scad_file('main_assembly')
-        if not main_file:
-            raise Exception("can't find source for main_assembly")
         text = blurb.scrape_blurb(source_dir + '/' + main_file)
         blurbs = blurb.split_blurb(text)
         if len(text):

tests/7_segments.scad

@@ -0,0 +1,29 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+include <../core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/7_segments.scad>
+
+module 7_segments()
+    layout([for(s = 7_segments) 7_segment_size(s).x * 2], 5) let(s = 7_segments[$i])
+        7_segment_digits(s, 2);
+
+if($preview)
+    7_segments();

tests/BLDC_motors.scad

@@ -0,0 +1,31 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+include <../core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/bldc_motors.scad>
+
+module bldc_motors()
+    layout([for(b = bldc_motors) BLDC_diameter(b)])
+        rotate(-90)
+            BLDC(bldc_motors[$i]);
+
+if($preview)
+    let($show_threads = 1)
+        bldc_motors();

tests/BOM.scad

@@ -20,10 +20,10 @@
 //
 //! BOM and assembly demonstration
 //
+$explode = 1; // Normally set on the command line when generating assembly views with views.py
 include <../core.scad>
 include <../vitamins/sheets.scad>
 use <../vitamins/insert.scad>
-$explode = 1; // Normally set on the command line when generating assembly views with views.py
 
 screw = M3_cap_screw;
 sheet = PMMA3;

tests/LDRs.scad

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 include <../vitamins/ldrs.scad>
 
 use <../utils/layout.scad>

tests/PCB.scad

@@ -22,6 +22,8 @@ include <../vitamins/d_connectors.scad>
 include <../vitamins/leds.scad>
 include <../vitamins/axials.scad>
 include <../vitamins/smds.scad>
+include <../vitamins/7_segments.scad>
+include <../vitamins/potentiometers.scad>
 
 use <../vitamins/pcb.scad>
 
@@ -46,7 +48,7 @@ TMC2130 = ["TMC2130", "TMC2130",
     []
 ];
 
-test_pcb = ["TestPCB", "Test PCB",
+test_pcb = ["test_pcb", "Test PCB",
     100, 250, 1.6, // length, width, thickness
     3,      // Corner radius
     2.75,   // Mounting hole diameter
@@ -64,21 +66,25 @@ test_pcb = ["TestPCB", "Test PCB",
         [ 16,  2,   90, "smd_res", RES1206, "1K"],
         [ 19,  2,   90, "smd_res", RES0805, "1K"],
         [ 22,  2,   90, "smd_res", RES0603, "1K"],
+        [ 25,  2,   90, "smd_cap", CAP1206, 1.5],
+        [ 28,  2,   90, "smd_cap", CAP0805, 1.0],
+        [ 31,  2,   90, "smd_cap", CAP0603, 0.7],
+
         [ 10,  10,   0, "2p54header", 4, 1],
         [ 25,  10,   0, "2p54header", 5, 1, false, "blue" ],
         [ 10,  20,   0, "2p54boxhdr", 4, 2],
         [ 10,  30,   0, "2p54socket", 6, 1],
         [ 25,  30,   0, "2p54socket", 4, 1, false, 0, false, "red" ],
-        [ 10,  40,   0, "chip", 10, 5, 1, grey(20)],
-        [  5,  50,   0, "led", LED3mm, "red"],
-        [ 12,  50,   0, "led", LED5mm, "orange"],
-        [ 25,  50,   0, "led", LED10mm, "yellow"],
-        [ 10,  65, 180, "rj45"],
-        [  8,  85, 180, "usb_A"],
+        [ 65,  50,   0, "led", LED3mm, "red"],
+        [ 75,  50,   0, "led", LED5mm, "orange"],
+        [ 90,  50,   0, "led", LED10mm, "yellow"],
+        [ 10,  45, 180, "rj45"],
+        [  8,  65, 180, "usb_A"],
         [  8, 105, 180, "usb_Ax2"],
+        [  7,  85, 180, "molex_usb_Ax1"],
+        [ 8.5,125, 180, "molex_usb_Ax2"],
         [  3, 140, 180, "usb_uA"],
         [  8, 155, 180, "usb_B"],
-        [  8.5, 125, 180, "molex_usb_Ax2"],
         [ 25, 200,   0, "buzzer", 4.5, 8.5],
         [ 25, 218,   0, "buzzer"],
         [  8, 190, 180, "jack"],
@@ -91,6 +97,8 @@ test_pcb = ["TestPCB", "Test PCB",
         [ 65,  12,   0, "ax_res", res1_8, 1000],
         [ 65,  17,   0, "ax_res", res1_4, 10000],
         [ 65,  22,   0, "ax_res", res1_2, 100000],
+        [ 55,  22,   0, "vero_pin"],
+        [ 55,  17,   0, "vero_pin", true],
 
         [ 80,   9,   0, "link", inch(0.2), inch(0.4)],
         [ 80,  12,   0, "ax_res", res1_8, 1000000, 1, inch(0.1)],
@@ -127,11 +135,14 @@ test_pcb = ["TestPCB", "Test PCB",
         [ 52, 200,   0, "pcb", 11, TMC2130 ],
         [ 80, 200,   0, "pdip", 24, "27C32", true, inch(0.6) ],
         [ 80, 170,   0, "pdip", 8, "NE555" ],
+        [ 80, 150,   0, "chip", 10, 5, 1, grey(20)],
+
         [ 52, 206,   0, "2p54socket", 8, 1 ],
         [ 52, 194,   0, "2p54socket", 8, 1, false, 0, false, "red" ],
         [ 50, 220,   0, "standoff",  5, 4.5, 12.5, 2.54],
         [ 50, 240,   0, "potentiometer"],
-        [ 75, 240,   0, "potentiometer", 7, 8],
+        [ 75, 240,   0, "potentiometer", KY_040_encoder, 8],
+        [ 30,  85,   -90, "7seg", WT5011BSR, 2],
     ],
     // accessories
     []

tests/PCBs.scad

@@ -21,7 +21,7 @@ include <../vitamins/pcbs.scad>
 
 use <../utils/layout.scad>
 
-function spacing(p) = let(w = pcb_width(p)) w < 22 ? w + 3 : w + 10;
+function spacing(p) = let(w = pcb_width(p)) w < 22 ? w + 3 : w + 7;
 
 module pcbs() {
     layout([for(p = pcbs) spacing(p)], 0)
@@ -29,7 +29,12 @@ module pcbs() {
             rotate(90)
                 pcb_assembly(pcbs[$i], 5 + $i, 3);
 
-    translate([0, 110])
+    translate([0, 65])
+        layout([for(p = tiny_pcbs) pcb_length(p)], 3)
+            translate([0, -pcb_width(tiny_pcbs[$i]) / 2])
+                 pcb_assembly(tiny_pcbs[$i], 5 + $i, 3);
+
+    translate([0, 120])
         layout([for(p = perfboards) pcb_length(p)], 10)
             translate([0, -pcb_width(perfboards[$i]) / 2])
                 pcb_assembly(perfboards[$i], 5 + $i, 3);

tests/SK_brackets.scad

@@ -22,18 +22,20 @@ include <../vitamins/extrusions.scad>
 
 use <../utils/layout.scad>
 
-module sk_brackets() {
+module sk_brackets(examples = false) {
     screws = [M4_dome_screw, M4_cap_screw, M5_cap_screw, M5_cap_screw];
     nuts = [M4_hammer_nut, M4_sliding_t_nut, M5_sliding_t_nut, undef];
     // channel depth = 6 for 2020 extrusion, 9 for 3030 extrusion
     depths = [6, 6, 9, 0];
     layout([for(s = sk_brackets) 1.5 * sk_size(s)[1]]) {
         sk_bracket_assembly(sk_brackets[$i], screw_type = screws[$i], nut_type = nuts[$i], max_screw_depth = depths[$i]);
-        translate([0, -sk_hole_offset(sk_brackets[$i]) - extrusion_width($i < 2 ? E2020 : E3030) / 2, 0])
-            rotate([0, 90, 0])
-                extrusion($i < 2 ? E2020 : E3030, 20, false);
+
+        if(examples)
+            translate([0, -sk_hole_offset(sk_brackets[$i]) - extrusion_width($i < 2 ? E2020 : E3030) / 2, 0])
+                rotate([0, 90, 0])
+                    extrusion($i < 2 ? E2020 : E3030, 20, false);
     }
 }
 
 if($preview)
-    sk_brackets();
+    sk_brackets(true);

tests/SMDs.scad

@@ -28,6 +28,11 @@ module smds() {
     translate([0, 3])
         layout([for(l = smd_leds) smd_led_size(l).x], 1)
             smd_led(smd_leds[$i], ["green", "blue", "red"][$i % 3]);
+
+    translate([0, 6])
+        layout([for(c = smd_capacitors) smd_cap_size(c).x], 1)
+            let(c = smd_capacitors[$i])
+                smd_capacitor(c, smd_cap_size(c).y * 0.8);
 }
 
 if($preview)

tests/ball_bearings.scad

@@ -16,7 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
-
+include <../core.scad>
 use <../utils/layout.scad>
 
 include <../vitamins/ball_bearings.scad>

tests/box_sections.scad

@@ -0,0 +1,30 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+include <../utils/core/core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/box_sections.scad>
+
+module box_sections() {
+    layout([for(b = box_sections) box_section_size(b).x], 20)
+        box_section(box_sections[$i], 100);
+}
+
+if($preview)
+    box_sections();

tests/displays.scad

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 use <../utils/layout.scad>
 
 include <../vitamins/displays.scad>
@@ -23,7 +24,10 @@ use <../vitamins/pcb.scad>
 
 module displays()
     layout([for(d = displays) pcb_length(display_pcb(d))], 10)
-        display(displays[$i]);
+        translate([0, pcb_width(displays[$i]) / 2])
+            vflip()
+                display(displays[$i]);
 
 if($preview)
-    displays();
+    let($show_threads = true)
+        displays();

tests/extrusion_brackets.scad

@@ -16,13 +16,51 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
-include <../utils/core/core.scad>
+include <../core.scad>
 
-include <../vitamins/extrusion_brackets.scad>
 include <../vitamins/extrusions.scad>
+include <../vitamins/extrusion_brackets.scad>
 include <../vitamins/washers.scad>
 include <../vitamins/nuts.scad>
 
+module inner_bracket_test(bracket, backwards = false)
+    rotate([90, 0, 180]) {
+        extrusion = extrusion_inner_corner_bracket_extrusion(bracket);
+        eWidth = extrusion_width(extrusion);
+        size = extrusion_inner_corner_bracket_size(bracket);
+        tnut = extrusion_inner_corner_bracket_tnut(bracket);
+
+        translate([backwards ? -eWidth : 0, 0])
+            extrusion_inner_corner_bracket(bracket, backwards = backwards);
+
+        translate([-eWidth / 2, 0])
+            rotate([-90, 0, 0])
+                extrusion(extrusion, size.x - nut_thickness(tnut) - extrusion_tab_thickness(extrusion), false, cornerHole = eWidth > 20);
+
+        translate([-eWidth, -eWidth / 2])
+            rotate([0, 90, 0])
+                extrusion(extrusion, eWidth + size.y - nut_thickness(tnut) - extrusion_tab_thickness(extrusion), false, cornerHole = eWidth > 20);
+    }
+
+
+module bracket_test(bracket)
+    rotate([90, 0, 180]) {
+        extrusion = extrusion_corner_bracket_extrusion(bracket);
+        eWidth = extrusion_width(extrusion);
+        size = extrusion_corner_bracket_size(bracket);
+
+        extrusion_corner_bracket_assembly(bracket);
+
+        translate([-eWidth / 2, 0])
+            rotate([-90, 0, 0])
+                extrusion(extrusion, size.y, false, cornerHole = eWidth > 20);
+
+        translate([-eWidth, -eWidth / 2])
+            rotate([0, 90, 0])
+                extrusion(extrusion, eWidth + size.x, false, cornerHole = eWidth > 20);
+    }
+
+
 module extrusion_brackets(examples = false) {
     extrusion_inner_corner_bracket(E20_inner_corner_bracket);
 
@@ -32,34 +70,30 @@ module extrusion_brackets(examples = false) {
     translate([60, 0])
         extrusion_corner_bracket_assembly(E20_corner_bracket);
 
-    eWidth = extrusion_width(E2020);
+    translate([110, 0])
+         extrusion_inner_corner_bracket(E40_inner_corner_bracket);
+
+    translate([140, 0])
+        extrusion_corner_bracket_assembly(E40_corner_bracket);
 
     if(examples) {
-        translate([20, 60, 10]) rotate([90, 0, 180]) {
-            extrusion_inner_corner_bracket(E20_inner_corner_bracket);
+        translate([20, 50, 10])
+            inner_bracket_test(E20_inner_corner_bracket, true);
 
-            translate([-eWidth / 2, 0, 0])
-                rotate([-90, 0, 0])
-                    extrusion(E2020, 20, false);
+        translate([20, 80, 10])
+            inner_bracket_test(E20_inner_corner_bracket);
 
-            translate([-eWidth, -eWidth / 2, 0])
-                rotate([0, 90, 0])
-                    extrusion(E2020, 40, false);
-        }
+        translate([20, 120, 10])
+            bracket_test(E20_corner_bracket);
 
-        translate([100, 60, 10]) rotate([90, 0, 180]) {
-            extrusion_corner_bracket_assembly(E20_corner_bracket);
+        translate([100, 70, 10])
+            inner_bracket_test(E40_inner_corner_bracket);
 
-            translate([-eWidth / 2, 0, 0])
-                rotate([-90, 0, 0])
-                    extrusion(E2020, 30, false);
-
-            translate([-eWidth, -eWidth / 2, 0])
-                rotate([0, 90, 0])
-                    extrusion(E2020, 50, false);
-        }
+        translate([100, 130, 10])
+            bracket_test(E40_corner_bracket);
     }
 }
 
 if($preview)
-    extrusion_brackets(true);
+    let($show_threads = true)
+        extrusion_brackets(true);

tests/extrusions.scad

@@ -21,9 +21,24 @@ use <../utils/layout.scad>
 
 include <../vitamins/extrusions.scad>
 
+gap = 10;
+
 module extrusions()
-    layout([for(e = extrusions) extrusion_width(e)], 10)
-        extrusion(extrusions[$i], 80, cornerHole = extrusion_width(extrusions[$i]) > 20);
+    layout([for(e = extrusions) is_list(e[0]) ? extrusion_width(e[0]) : extrusion_width(e)], gap)
+        let(e = extrusions[$i])
+            if(is_list(e[0])) {
+                list = e;
+                heights = [for(e = list) extrusion_height(e)];
+                l = len(heights) - 1;
+                offset = (heights * [for(i = [0 : l]) 1] + l * gap) / 2;
+                translate([0, -offset])
+                    rotate(90)
+                        layout(heights, gap)
+                            rotate(-90)
+                                extrusion(list[$i], 80, cornerHole = extrusion_width(list[$i]) > 20);
+            }
+            else
+                extrusion(e, 80, cornerHole = extrusion_width(e) > 20);
 
 if ($preview)
     extrusions();

tests/geared_steppers.scad

@@ -16,12 +16,13 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 include <../vitamins/geared_steppers.scad>
 
 use <../utils/layout.scad>
 
 module geared_steppers()
-    layout([for(g = geared_steppers) gs_diameter(g)], 5)
+    layout([for(g = geared_steppers) max(gs_diameter(g), gs_pitch(g) + gs_lug_w(g) / 2)], 5)
         geared_stepper(geared_steppers[$i]);
 
 geared_steppers();

tests/green_terminals.scad

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 use <../utils/layout.scad>
 
 include <../vitamins/green_terminals.scad>

tests/hygrometer.scad

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 use <../vitamins/hygrometer.scad>
 
 if($preview)

tests/microview.scad

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 use <../vitamins/microview.scad>
 
 microview(!$preview);

tests/nuts.scad

@@ -52,6 +52,12 @@ module nuts() {
 
             if(n == M5_nut)
                 sliding_t_nut(M5_sliding_t_nut);
+
+            if(n == M6_nut)
+                sliding_t_nut(M6_sliding_t_nut);
+
+            if(n == M8_nut)
+                sliding_t_nut(M8_sliding_ball_t_nut);
         }
 
         translate([0, 80]) {

tests/o_ring.scad

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
+include <../core.scad>
 use <../vitamins/o_ring.scad>
 
 module o_rings()

tests/pin_headers.scad

@@ -64,8 +64,9 @@ module pin_headers() {
             pin_socket(pin_headers[$i], 3, 3, right_angle = true);
     }
 
-    for(i = [0, 1], p = [5, 2][i], j = [0 , 1]) {
-        h = [jst_ph_header, jst_xh_header][j];
+    headers = [jst_zh_header, jst_ph_header, jst_xh_header];
+    for(i = [0, 1], p = [5, 2][i], j = [0 : len(headers) - 1]) {
+        h = headers[j];
         translate([-20 * (i + 1), 0 + j * 40])
             jst_xh_header(h, p);
 

tests/potentiometers.scad

@@ -0,0 +1,31 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+//! Potentiometers and rotary encoders
+include <../core.scad>
+include <../utils/layout.scad>
+include <../vitamins/potentiometers.scad>
+
+module potentiometers()
+    layout([for(p = potentiometers) pot_size(p).x])
+        hflip()
+            potentiometer(potentiometers[$i], shaft_length = 30);
+
+if($preview)
+    let($show_threads = true)
+        potentiometers();

tests/press_fit.scad

@@ -16,8 +16,8 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
-
-include <../printed/press_fit.scad>
+include <../core.scad>
+use <../printed/press_fit.scad>
 
 module press_fits()
 {

tests/rails.scad

@@ -22,21 +22,28 @@ include <../vitamins/rails.scad>
 use <../utils/layout.scad>
 use <../vitamins/nut.scad>
 
+length = 200;
 sheet = 3;
 pos = 1; //[-1 : 0.1 : 1]
 
+function rail_carriages(rail) = [for(c = carriages) if(carriage_rail(c) == rail) c];
+
 module rails()
-    layout([for(l = carriages) carriage_width(l)], 20)
+    layout([for(r = rails) carriage_width(rail_carriages(r)[0])], 10)
         rotate(-90) {
-            carriage = carriages[$i];
-            rail = carriage_rail(carriage);
-            length = 200;
+            rail = rails[$i];
+            carriages = rail_carriages(rail);
+            carriage = carriages[0];
             screw = rail_screw(rail);
             nut = screw_nut(screw);
             washer = screw_washer(screw);
 
             rail_assembly(carriage, length, pos * carriage_travel(carriage, length) / 2, $i<2 ? grey(20) : "green", $i<2 ? grey(20) : "red");
 
+            if(len(carriages) > 1)
+                translate([-carriage_travel(carriages[1], length) / 2, 0])
+                    carriage(carriages[1]);
+
             rail_screws(rail, length, sheet + nut_thickness(nut, true) + washer_thickness(washer));
 
             rail_hole_positions(rail, length, 0)

tests/screws.scad

@@ -48,7 +48,7 @@ module screws() {
         for(x = [0 : len(screw_lists[y]) -1]) {
             screw = screw_lists[y][x];
             if(screw) {
-                 length = screw_head_type(screw) == hs_grub ? 6
+                 length = screw_head_type(screw) == hs_grub ? screw_radius(screw) * 4
                         : screw_radius(screw) <= 1.5 ? 10
                         : screw_max_thread(screw) ? screw_longer_than(screw_max_thread(screw) + 5)
                         : 30;

tests/servo_motors.scad

@@ -0,0 +1,31 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+include <../core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/servo_motors.scad>
+
+module servo_motors()
+    layout([for(s = servo_motors) servo_motor_width(s)], 10) let(s = servo_motors[$i]) {
+        rotate(-90)             // Show the keyway
+            servo_motor(s);
+    }
+
+if($preview)
+    servo_motors();

tests/stepper_motors.scad

@@ -22,12 +22,12 @@ include <../vitamins/stepper_motors.scad>
 use <../utils/layout.scad>
 
 module stepper_motors()
-    layout([for(s = stepper_motors) NEMA_width(s)], 5, no_offset = true) let(m = stepper_motors[$i]) {
+    layout([for(s = stepper_motors) NEMA_width(s)], 5, no_offset = false) let(m = stepper_motors[$i]) {
         rotate(180)
-            NEMA(m, 0, m == NEMA17P || m == NEMA17M || m == NEMA17M8);
+            NEMA(m, 0, in([NEMA17P, NEMA17M, NEMA17M8, NEMA8, NEMA8BH], m));
 
         translate_z(4)
-            NEMA_screws(m, M3_pan_screw, n = $i, earth = $i > 4 ? undef : $i - 1);
+            NEMA_screws(m, M3_pan_screw, n = $i - 2, earth = $i > 6 ? undef : $i - 3);
     }
 
 if($preview)

utils/core/bom.scad

@@ -29,7 +29,7 @@
 //! This is to prevent the global BOM page becoming too wide in large projects by having it include just the major assemblies.
 //!
 //! The example below shows how to define a vitamin and incorporate it into an assembly with sub-assemblies and make an exploded view.
-//! The resulting flat BOM is shown but heirachical BOMs are also generated for real projects.
+//! The resulting flat BOM is shown but hierarchical BOMs are also generated for real projects.
 //!
 //! If the code to make an STL or DXF is made a child of the `stl()` or `dxf()` module then the STL or DXF will be used in the assembly views generated by `views.py` instead of generating
 //! it with code.
@@ -42,24 +42,24 @@
 //! * To get the parameter values make the GUI window square, pose the view with the mouse and then copy the viewport parameters from the Edit menu and paste them into the pose invocation.
 //! * Two `pose()` modules can be chained to allow different poses for exploded and assembled views.
 //
-function bom_mode(n = 1) = $_bom >= n && (is_undef($on_bom) || $on_bom);  //! Current BOM mode, 0 = none, 1 = printed and routed parts and assemblies, 2 includes vitamins as well
-function exploded() = is_undef($exploded_parent) ? $exploded : 0;   //! Returns the value of `$exploded` if it is defined, else `0`
+function bom_mode(n = 1) = (is_undef($bom) ? 0 : $bom) >= n && (is_undef($on_bom) || $on_bom);  //! Current BOM mode, 0 = none, 1 = printed and routed parts and assemblies, 2 includes vitamins as well
+function exploded() = is_undef($exploded_parent) ? is_undef($explode) ? 0 : $explode : 0;   //! Returns the value of `$exploded` if it is defined, else `0`
 function show_supports() = !$preview || exploded();                 //! True if printed support material should be shown
 
 module no_explode() let($exploded_parent = true) children();        //! Prevent children being exploded
 module explode(d, explode_children = false, offset = [0,0,0]) {     //! Explode children by specified Z distance or vector `d`, option to explode grand children
     v = is_list(d) ? d : [0, 0, d];
     o = is_list(offset) ? offset : [0, 0, offset];
-    if($exploded && is_undef($exploded_parent) && norm(v)) {
+    if(exploded() && norm(v)) {
         translate(o)                                                // Draw the line first in case the child is transparent
             color("yellow") hull() {
                 sphere(0.2);
 
-                translate(v * $exploded)
+                translate(v * exploded())
                     sphere(0.2);
             }
 
-        translate(v * $exploded)
+        translate(v * exploded())
             let($exploded_parent = explode_children ? undef : true)
                 children();
     }

utils/core/clip.scad

@@ -18,7 +18,7 @@
 //
 
 //
-//! Construct arbirarily large box to partition 3D space and clip objects, useful for creating cross sections to see the inside when debugging.
+//! Construct arbitrarily large box to partition 3D space and clip objects, useful for creating cross sections to see the inside when debugging.
 //!
 //! Original version by Doug Moen on the OpenSCAD forum
 //

utils/core/polyholes.scad

@@ -28,12 +28,12 @@
 //! large increase in the number of facets.
 //! When set to 1 the polygons alternate each layer, when set higher the rotation takes `twist + 1` layers to repeat.
 //! A small additional rotation is added to make the polygon rotate one more side over the length of the hole to make it appear round when
-//! veiwed end on.
+//! viewed end on.
 //!
 //! When `twist` is set the resulting cylinder is extended by `eps` at each end so that the exact length of the hole can be used without
 //! leaving a scar on either surface.
 //
-function sides(r, n = undef) = is_undef(n) ? max(round(4 * r), 3) : n ? max(n, 3) : r2sides(r); //! Optimium number of sides for specified radius
+function sides(r, n = undef) = is_undef(n) ? max(round(4 * r), 3) : n ? max(n, 3) : r2sides(r); //! Optimum number of sides for specified radius
 function corrected_radius(r, n = undef)   = r / cos(180 / sides(r, n));                         //! Adjusted radius to make flats lie on the circle
 function corrected_diameter(d, n = undef) = 2 * corrected_radius(d / 2 , n);                    //! Adjusted diameter to make flats lie on the circle
 

utils/core/teardrops.scad

@@ -26,7 +26,7 @@
 //
 module teardrop(h, r, center = true, truncate = true, chamfer = 0, chamfer_both_ends = true, plus = false) { //! For making horizontal holes that don't need support material, set `truncate = false` to make traditional RepRap teardrops that don't even need bridging
     module teardrop_2d(r, truncate) {
-        er = layer_height / 2 - eps;    // Extrustion edge radius
+        er = layer_height / 2 - eps;    // Extrusion edge radius
         R = plus ? r + er : r;          // Corrected radius
         offset = plus ? -er : 0;        // Offset inwards
         hull()

utils/core_xy.scad

@@ -180,24 +180,25 @@ module coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_off
         tooth_colour = lower_belt ? coreXY_lower_tooth_colour(type) : coreXY_upper_tooth_colour(type));
 }
 
-module coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false) { //! Wrapper module to draw both belts of a coreXY setup
+module coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false, left_lower = false) { //! Wrapper module to draw both belts of a coreXY setup
     translate([size.x / 2 - separation.x / 2, size.y / 2, -separation.z / 2]) {
         // lower belt
-        hflip()
+        hflip(!left_lower)
             explode(25)
-                coreXY_half(type, size, [size.x - pos.x - separation.x, pos.y], separation.y, x_gap, plain_idler_offset, [-lower_drive_pulley_offset.x, lower_drive_pulley_offset.y], show_pulleys, lower_belt = true, hflip = true);
+                coreXY_half(type, size, [size.x - pos.x - separation.x/2 - (left_lower ? x_gap : 0), pos.y], separation.y, x_gap, plain_idler_offset, [-lower_drive_pulley_offset.x, lower_drive_pulley_offset.y], show_pulleys, lower_belt = true, hflip = true);
 
         // upper belt
         translate([separation.x, 0, separation.z])
-            explode(25)
-                coreXY_half(type, size, [pos.x, pos.y], separation.y, x_gap, plain_idler_offset, upper_drive_pulley_offset, show_pulleys, lower_belt = false, hflip=false);
+            hflip(left_lower)
+                explode(25)
+                    coreXY_half(type, size, [pos.x + separation.x/2 + (left_lower ? x_gap : 0), pos.y], separation.y, x_gap, plain_idler_offset, upper_drive_pulley_offset, show_pulleys, lower_belt = false, hflip = false);
     }
 }
 
-module coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false) { //! Draw the coreXY belts
+module coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false, left_lower = false) { //! Draw the coreXY belts
     assert(coreXYPosBL.z == coreXYPosTR.z);
 
     coreXYSize = coreXYPosTR - coreXYPosBL;
     translate(coreXYPosBL)
-        coreXY(type, coreXYSize, [carriagePosition.x - coreXYPosBL.x + separation.x / 2, carriagePosition.y - coreXYPosBL.y], separation = separation, x_gap = x_gap, plain_idler_offset = 0, upper_drive_pulley_offset = upper_drive_pulley_offset, lower_drive_pulley_offset = lower_drive_pulley_offset, show_pulleys = show_pulleys);
+        coreXY(type, coreXYSize, [carriagePosition.x - coreXYPosBL.x, carriagePosition.y - coreXYPosBL.y], separation = separation, x_gap = x_gap, plain_idler_offset = 0, upper_drive_pulley_offset = upper_drive_pulley_offset, lower_drive_pulley_offset = lower_drive_pulley_offset, show_pulleys = show_pulleys, left_lower = left_lower);
 }

utils/gears.scad

@@ -135,4 +135,4 @@ function involute_worm_profile(m, pa = 20, clearance = undef) = //! Calculate wo
     let(tooth = involute_rack_tooth_profile(m),
         pitch = PI * m,
         y_min = min([for(p = tooth) p.y])
-    ) [for(p = tooth) [p.x - pitch / 2, p.y - y_min, 0]];   // Offset to be positive in y, centred in x and add 0 z ordintate
+    ) [for(p = tooth) [p.x - pitch / 2, p.y - y_min, 0]];   // Offset to be positive in y, centred in x and add 0 z coordinate

utils/rounded_polygon.scad

@@ -75,28 +75,28 @@ function rounded_polygon_length(points, tangents) = //! Calculate the length giv
 module rounded_polygon(points, _tangents = undef) { //! Draw the rounded polygon from the point list, can pass the tangent list to save it being calculated
     len = len(points);
     indices = [0 : len - 1];
-    tangents = [ for (t = _tangents ? _tangents : rounded_polygon_tangents(points)) each [t.x, t.y] ];
+    tangents = _tangents ? _tangents : rounded_polygon_tangents(points);
 
-    difference(convexity = points) {
+    difference() {
         union() {
-            for(i = indices)
+            for(i = indices, last = (i - 1 + len) % len)
                 if(points[i][2] > 0)
                     hull() {
-                        translate([points[i].x, points[i].y])
+                        translate(vec2(points[i]))
                             circle(points[i][2]);
 
-                        polygon([tangents[(2 * i - 1 + 2 * len) % (2 * len)], tangents[2 * i], [points[i].x, points[i].y]]);
+                        polygon([vec2(tangents[last][1]), vec2(tangents[i][0]), vec2(points[i])]);
                     }
 
-            polygon(tangents, convexity = points);
+            polygon([for(t = tangents) each(vec2(t))], convexity = points);
         }
-        for(i = indices)
+        for(i = indices, last = (i - 1 + len) % len)
             if(points[i][2] < 0)
                 hull() {
-                    translate([points[i].x, points[i].y])
+                    translate(vec2(points[i]))
                         circle(-points[i][2]);
 
-                    polygon([tangents[(2 * i - 1 + 2 * len) % (2 * len)], tangents[2 * i], [points[i].x, points[i].y]]);
+                    polygon([vec2(tangents[last][1]), vec2(tangents[i][0]), vec2(points[i])]);
                 }
      }
 }

utils/sweep.scad

@@ -18,7 +18,7 @@
 //
 
 //
-//! Utility to generate a polhedron by sweeping a 2D profile along a 3D path and utilities for generating paths.
+//! Utility to generate a polyhedron by sweeping a 2D profile along a 3D path and utilities for generating paths.
 //!
 //! The initial orientation is the Y axis of the profile points towards the initial center of curvature, Frenet-Serret style.
 //! Subsequent rotations use the minimum rotation method.

utils/thread.scad

@@ -50,6 +50,7 @@ function thread_profile(h, crest, angle, overlap = 0.1) = //! Create thread prof
         [[-base / 2, -overlap, 0], [-crest / 2, h, 0], [crest / 2, h, 0], [base / 2, -overlap, 0]];
 
 module thread(dia, pitch, length, profile, center = true, top = -1, bot = -1, starts = 1, solid = true, female = false, colour = undef) { //! Create male or female thread, ends can be tapered, chamfered or square
+    assert(is_undef(colour) || is_list(colour), "Thread colour must be in [r, g, b] form");
     //
     // Apply colour if defined
     //
@@ -155,7 +156,7 @@ module thread(dia, pitch, length, profile, center = true, top = -1, bot = -1, st
                                         translate([0, offset])
                                             square([r, len]);
 
-                                        translate([0, bot_chamfer_h])
+                                        translate([0, offset + bot_chamfer_h])
                                             square([r + h + overlap, len - top_chamfer_h - bot_chamfer_h]);
                                     }
                                     if(!solid)
@@ -190,7 +191,8 @@ module female_metric_thread(d, pitch, length, center = true, top = -1, bot = -1,
 }
 
 function metric_coarse_pitch(d) //! Convert metric diameter to pitch
-    = d == 1.6 ? 0.35  // M1.6
+    = d == 1.4 ? 0.3   // M1.4
+    : d == 1.6 ? 0.35  // M1.6
                : [0.4, // M2
                   0.45,// M2.5
                   0.5, // M3

utils/tube.scad

@@ -25,7 +25,9 @@ include <../utils/core/core.scad>
 module ring(or, ir) //! Create a ring with specified external and internal radii
         difference() {
             circle4n(or);
-            circle4n(ir);
+
+            if(ir > 0)
+                circle4n(ir);
         }
 
 module tube(or, ir, h, center = true) //! Create a tube with specified external and internal radii and height `h`
@@ -69,7 +71,7 @@ module woven_tube(or, ir, h, center= true, colour = grey(30), colour2, warp = 2,
     }
 }
 
-module rectangular_tube(size, center = true, thickness = 1, fillet = 0.5) { //! Create a retangular tube with filleted corners
+module rectangular_tube(size, center = true, thickness = 1, fillet = 0.5) { //! Create a rectangular tube with filleted corners
     extrude_if(size.z, center = center)
         difference() {
             rounded_square([size.x, size.y], fillet);

vitamins/7_segment.scad

@@ -0,0 +1,107 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+
+//
+//! 7 Segment displays
+//
+include <../utils/core/core.scad>
+
+
+function 7_segment_size(type)       = type[1]; //! Size of the body
+function 7_segment_digit_size(type) = type[2]; //! Size of the actual digit and segemnt width and angle
+function 7_segment_pins(type)       = type[3]; //! [x, y] array of pins
+function 7_segment_pin_pitch(type)  = type[4]; //! x and y pin pitches and pin diameter
+
+module 7_segment_digit(type, colour = grey(95), pin_length = 6.4) { //! Draw the specified 7 segment digit
+    size = 7_segment_size(type);
+    digit = 7_segment_digit_size(type);
+    pins = 7_segment_pins(type);
+    pin_pitch = 7_segment_pin_pitch(type);
+
+    color(grey(95))
+        linear_extrude(size.z)
+            square([size.x - 0.1, size.y], center = true);
+
+    color(grey(15))
+        translate_z(size.z)
+            cube([size.x - 0.1, size.y, eps], center = true);
+
+    color(colour)
+         translate_z(size.z)
+            linear_extrude(2 * eps) {
+                t = digit[2];
+                a = digit[3];
+                sq = [digit.x - 2 * t, (digit.y - 3 * t) / 2];
+
+                multmatrix([                    // Skew
+                    [1, tan(a), 0, 0],
+                    [0, 1, 0, 0],
+                    [0, 0, 1, 0],
+                    [0, 0, 0, 1]
+                ])
+                difference() {
+                    square([digit.x, digit.y], center = true);
+
+                    for(y = [-1, 1], x = [-1, 1]) {
+                        translate([0, y * (t + sq.y) / 2])
+                            square(sq, center = true);
+
+
+                        translate([x * digit.x / 2, y * digit.y / 2])
+                            rotate(-45 * x * y) {
+                                square([10, t], center = true);
+
+                                square([t / 5, 10], center = true);
+                            }
+
+                        translate([x * (digit.x - t) / 2, 0])
+                            rotate(45) {
+                                square([t / 5, t * 2], center = true);
+
+                                square([t * 2, t / 5], center = true);
+
+                                translate([x * t / 2, -x * t / 2])
+                                    square([t, t], center = true);
+                            }
+                    }
+                }
+                r = 1.25 * t / 2;
+                translate([digit.x / 2 - r + digit.y / 2 * tan(a), -digit.y / 2 + r])
+                    circle(r);
+            }
+
+    color(silver)
+        translate_z(-pin_length)
+            linear_extrude(pin_length)
+                for(x = [0 : 1 : pins.x - 1], y = [0 : 1 : pins.y - 1])
+                    translate([(x - (pins.x - 1) / 2) * pin_pitch.x, (y - (pins.y - 1) / 2) * pin_pitch.y])
+                        circle(d = pin_pitch[2], $fn = 16);
+}
+
+module 7_segment_digits(type, n, colour = grey(70), pin_length = 6.4, cutout = false) { //! Draw n digits side by side
+    size = 7_segment_size(type);
+
+    if(cutout)
+        linear_extrude(100)
+            square([n * size.x, size.y], center = true);
+    else
+        for(i = [0 : 1 : n - 1])
+            translate([(i - (n - 1) / 2) * size.x, 0])
+                7_segment_digit(type, colour, pin_length);
+}

vitamins/7_segments.scad

@@ -0,0 +1,28 @@
+//
+// NopSCADlib Copyright Chris Palmer 2021
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+
+//
+//! 7 Segment displays
+//
+
+WT5011BSR = ["WT5011BSR", [12.7, 19, 8.2], [7.2, 12.7, 1.2, 10], [5, 2], [inch(0.1), inch(0.6), 0.4]];
+
+7_segments = [ WT5011BSR ];
+
+use <7_segment.scad>