Updated readme

Updated images and readme.

readme.md

@@ -21,22 +21,23 @@ See [usage](docs/usage.md) for requirements, installation instructions and a usa
 <tr><td> <a href = "#Ball_bearings">Ball_bearings</a> </td><td> <a href = "#Nuts">Nuts</a> </td><td> <a href = "#Box">Box</a> </td><td> <a href = "#Annotation">Annotation</a> </td><td> <a href = "#Bom">Bom</a> </td></tr>
 <tr><td> <a href = "#Batteries">Batteries</a> </td><td> <a href = "#O_ring">O_ring</a> </td><td> <a href = "#Butt_box">Butt_box</a> </td><td> <a href = "#Bezier">Bezier</a> </td><td> <a href = "#Clip">Clip</a> </td></tr>
 <tr><td> <a href = "#Belts">Belts</a> </td><td> <a href = "#Opengrab">Opengrab</a> </td><td> <a href = "#Cable_grommets">Cable_grommets</a> </td><td> <a href = "#Dogbones">Dogbones</a> </td><td> <a href = "#Global">Global</a> </td></tr>
-<tr><td> <a href = "#Blowers">Blowers</a> </td><td> <a href = "#Pcbs">Pcbs</a> </td><td> <a href = "#Carriers">Carriers</a> </td><td> <a href = "#Fillet">Fillet</a> </td><td> <a href = "#Polyholes">Polyholes</a> </td></tr>
-<tr><td> <a href = "#Bulldogs">Bulldogs</a> </td><td> <a href = "#Pillars">Pillars</a> </td><td> <a href = "#Corner_block">Corner_block</a> </td><td> <a href = "#Hanging_hole">Hanging_hole</a> </td><td> <a href = "#Rounded_rectangle">Rounded_rectangle</a> </td></tr>
-<tr><td> <a href = "#Buttons">Buttons</a> </td><td> <a href = "#Pin_headers">Pin_headers</a> </td><td> <a href = "#Door_hinge">Door_hinge</a> </td><td> <a href = "#Layout">Layout</a> </td><td> <a href = "#Sphere">Sphere</a> </td></tr>
-<tr><td> <a href = "#Cable_strips">Cable_strips</a> </td><td> <a href = "#Psus">Psus</a> </td><td> <a href = "#Door_latch">Door_latch</a> </td><td> <a href = "#Maths">Maths</a> </td><td> <a href = "#Teardrops">Teardrops</a> </td></tr>
-<tr><td> <a href = "#Components">Components</a> </td><td> <a href = "#Pulleys">Pulleys</a> </td><td> <a href = "#Fan_guard">Fan_guard</a> </td><td> <a href = "#Offset">Offset</a> </td><td></td></tr>
-<tr><td> <a href = "#D_connectors">D_connectors</a> </td><td> <a href = "#Rails">Rails</a> </td><td> <a href = "#Fixing_block">Fixing_block</a> </td><td> <a href = "#Quadrant">Quadrant</a> </td><td></td></tr>
-<tr><td> <a href = "#Displays">Displays</a> </td><td> <a href = "#Ring_terminals">Ring_terminals</a> </td><td> <a href = "#Flat_hinge">Flat_hinge</a> </td><td> <a href = "#Round">Round</a> </td><td></td></tr>
-<tr><td> <a href = "#Extrusions">Extrusions</a> </td><td> <a href = "#Rockers">Rockers</a> </td><td> <a href = "#Foot">Foot</a> </td><td> <a href = "#Rounded_cylinder">Rounded_cylinder</a> </td><td></td></tr>
-<tr><td> <a href = "#Fans">Fans</a> </td><td> <a href = "#Rod">Rod</a> </td><td> <a href = "#Handle">Handle</a> </td><td> <a href = "#Rounded_polygon">Rounded_polygon</a> </td><td></td></tr>
-<tr><td> <a href = "#Fuseholder">Fuseholder</a> </td><td> <a href = "#Screws">Screws</a> </td><td> <a href = "#Pcb_mount">Pcb_mount</a> </td><td> <a href = "#Sector">Sector</a> </td><td></td></tr>
-<tr><td> <a href = "#Geared_steppers">Geared_steppers</a> </td><td> <a href = "#Scs_bearing_blocks">Scs_bearing_blocks</a> </td><td> <a href = "#Psu_shroud">Psu_shroud</a> </td><td> <a href = "#Sweep">Sweep</a> </td><td></td></tr>
-<tr><td> <a href = "#Green_terminals">Green_terminals</a> </td><td> <a href = "#Sealing_strip">Sealing_strip</a> </td><td> <a href = "#Ribbon_clamp">Ribbon_clamp</a> </td><td> <a href = "#Thread">Thread</a> </td><td></td></tr>
-<tr><td> <a href = "#Hot_ends">Hot_ends</a> </td><td> <a href = "#Sheets">Sheets</a> </td><td> <a href = "#Screw_knob">Screw_knob</a> </td><td> <a href = "#Tube">Tube</a> </td><td></td></tr>
-<tr><td> <a href = "#Hygrometer">Hygrometer</a> </td><td> <a href = "#Sk_brackets">Sk_brackets</a> </td><td> <a href = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#Iecs">Iecs</a> </td><td> <a href = "#Spades">Spades</a> </td><td> <a href = "#Ssr_shroud">Ssr_shroud</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#Inserts">Inserts</a> </td><td> <a href = "#Spools">Spools</a> </td><td> <a href = "#Strap_handle">Strap_handle</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Blowers">Blowers</a> </td><td> <a href = "#Pcb">Pcb</a> </td><td> <a href = "#Carriers">Carriers</a> </td><td> <a href = "#Fillet">Fillet</a> </td><td> <a href = "#Polyholes">Polyholes</a> </td></tr>
+<tr><td> <a href = "#Bulldogs">Bulldogs</a> </td><td> <a href = "#Pcbs">Pcbs</a> </td><td> <a href = "#Corner_block">Corner_block</a> </td><td> <a href = "#Hanging_hole">Hanging_hole</a> </td><td> <a href = "#Rounded_rectangle">Rounded_rectangle</a> </td></tr>
+<tr><td> <a href = "#Buttons">Buttons</a> </td><td> <a href = "#Pillars">Pillars</a> </td><td> <a href = "#Door_hinge">Door_hinge</a> </td><td> <a href = "#Layout">Layout</a> </td><td> <a href = "#Sphere">Sphere</a> </td></tr>
+<tr><td> <a href = "#Cable_strips">Cable_strips</a> </td><td> <a href = "#Pin_headers">Pin_headers</a> </td><td> <a href = "#Door_latch">Door_latch</a> </td><td> <a href = "#Maths">Maths</a> </td><td> <a href = "#Teardrops">Teardrops</a> </td></tr>
+<tr><td> <a href = "#Components">Components</a> </td><td> <a href = "#Psus">Psus</a> </td><td> <a href = "#Fan_guard">Fan_guard</a> </td><td> <a href = "#Offset">Offset</a> </td><td></td></tr>
+<tr><td> <a href = "#D_connectors">D_connectors</a> </td><td> <a href = "#Pulleys">Pulleys</a> </td><td> <a href = "#Fixing_block">Fixing_block</a> </td><td> <a href = "#Quadrant">Quadrant</a> </td><td></td></tr>
+<tr><td> <a href = "#Displays">Displays</a> </td><td> <a href = "#Rails">Rails</a> </td><td> <a href = "#Flat_hinge">Flat_hinge</a> </td><td> <a href = "#Round">Round</a> </td><td></td></tr>
+<tr><td> <a href = "#Extrusion_brackets">Extrusion_brackets</a> </td><td> <a href = "#Ring_terminals">Ring_terminals</a> </td><td> <a href = "#Foot">Foot</a> </td><td> <a href = "#Rounded_cylinder">Rounded_cylinder</a> </td><td></td></tr>
+<tr><td> <a href = "#Extrusions">Extrusions</a> </td><td> <a href = "#Rockers">Rockers</a> </td><td> <a href = "#Handle">Handle</a> </td><td> <a href = "#Rounded_polygon">Rounded_polygon</a> </td><td></td></tr>
+<tr><td> <a href = "#Fans">Fans</a> </td><td> <a href = "#Rod">Rod</a> </td><td> <a href = "#Pcb_mount">Pcb_mount</a> </td><td> <a href = "#Sector">Sector</a> </td><td></td></tr>
+<tr><td> <a href = "#Fuseholder">Fuseholder</a> </td><td> <a href = "#Screws">Screws</a> </td><td> <a href = "#Psu_shroud">Psu_shroud</a> </td><td> <a href = "#Sweep">Sweep</a> </td><td></td></tr>
+<tr><td> <a href = "#Geared_steppers">Geared_steppers</a> </td><td> <a href = "#Scs_bearing_blocks">Scs_bearing_blocks</a> </td><td> <a href = "#Ribbon_clamp">Ribbon_clamp</a> </td><td> <a href = "#Thread">Thread</a> </td><td></td></tr>
+<tr><td> <a href = "#Green_terminals">Green_terminals</a> </td><td> <a href = "#Sealing_strip">Sealing_strip</a> </td><td> <a href = "#Screw_knob">Screw_knob</a> </td><td> <a href = "#Tube">Tube</a> </td><td></td></tr>
+<tr><td> <a href = "#Hot_ends">Hot_ends</a> </td><td> <a href = "#Sheets">Sheets</a> </td><td> <a href = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Hygrometer">Hygrometer</a> </td><td> <a href = "#Sk_brackets">Sk_brackets</a> </td><td> <a href = "#Ssr_shroud">Ssr_shroud</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Iecs">Iecs</a> </td><td> <a href = "#Spades">Spades</a> </td><td> <a href = "#Strap_handle">Strap_handle</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Inserts">Inserts</a> </td><td> <a href = "#Spools">Spools</a> </td><td></td><td></td><td></td></tr>
 <tr><td> <a href = "#Jack">Jack</a> </td><td> <a href = "#Springs">Springs</a> </td><td></td><td></td><td></td></tr>
 <tr><td> <a href = "#Kp_pillow_blocks">Kp_pillow_blocks</a> </td><td> <a href = "#Ssrs">Ssrs</a> </td><td></td><td></td><td></td></tr>
 <tr><td> <a href = "#Ldrs">Ldrs</a> </td><td> <a href = "#Stepper_motors">Stepper_motors</a> </td><td></td><td></td><td></td></tr>
@@ -589,6 +590,54 @@ LCD dispays.
 |   1 | ```display(SSD1963_4p3)``` |  LCD display SSD1963 4.3" |
 
 
+<a href="#top">Top</a>
+
+---
+<a name="Extrusion_brackets"></a>
+## Extrusion_brackets
+Brackets for joining extrusions at a corner.
+
+
+[vitamins/extrusion_brackets.scad](vitamins/extrusion_brackets.scad) Object definitions.
+
+[vitamins/extrusion_bracket.scad](vitamins/extrusion_bracket.scad) Implementation.
+
+[tests/extrusion_brackets.scad](tests/extrusion_brackets.scad) Code for this example.
+
+### Properties
+| Function | Description |
+|:--- |:--- |
+| ```extrusion_corner_bracket_base_thickness(type)``` | Thickness of base of bracket |
+| ```extrusion_corner_bracket_hole_offset(type)``` | Hole offset from corner |
+| ```extrusion_corner_bracket_side_thickness(type)``` | Thickness of side of bracket |
+| ```extrusion_corner_bracket_size(type)``` | Size of bracket |
+| ```extrusion_inner_corner_bracket_size(type)``` | Size of inner bracket |
+
+### Modules
+| Module | Description |
+|:--- |:--- |
+| ```extrusion_corner_bracket(type)``` | Corner bracket for extrusion |
+| ```extrusion_corner_bracket_assembly(type, part_thickness = 2, screw_type = M4_cap_screw, nut_type = M4_sliding_t_nut, max_screw_depth = 6)``` | Assembly with fasteners in place |
+| ```extrusion_corner_bracket_hole_positions(type)``` | Place children at hole positions |
+| ```extrusion_inner_corner_bracket(type, grub_screws = true)``` | Inner corner bracket for extrusion |
+
+![extrusion_brackets](tests/png/extrusion_brackets.png)
+
+### Vitamins
+| Qty | Module call | BOM entry |
+| ---:|:--- |:---|
+|   1 | ```extrusion(E2020, 20, false)``` |  Extrusion E2020 x 20mm |
+|   1 | ```extrusion(E2020, 30, false)``` |  Extrusion E2020 x 30mm |
+|   1 | ```extrusion(E2020, 40, false)``` |  Extrusion E2020 x 40mm |
+|   1 | ```extrusion(E2020, 50, false)``` |  Extrusion E2020 x 50mm |
+|   2 | ```extrusion_corner_bracket(E20_corner_bracket)``` |  Extrusion corner bracket 20 |
+|   2 | ```extrusion_inner_corner_bracket(E20_inner_corner_bracket, true)``` |  Extrusion inner corner bracket 4.5 |
+|   1 | ```extrusion_inner_corner_bracket(E20_inner_corner_bracket, false)``` |  Extrusion inner corner bracket 4.5 |
+|   4 | ```sliding_t_nut(M4_sliding_t_nut)``` |  Nut M4 sliding T |
+|   4 | ```screw(M4_cap_screw, 8)``` |  Screw M4 cap x  8mm |
+|   4 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
+
+
 <a href="#top">Top</a>
 
 ---
@@ -620,21 +669,21 @@ Aluminium  extrusion.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```extrusion(type, length, cornerHole = false)``` | Draw the specified extrusion |
+| ```extrusion(type, length, center = false, cornerHole = false)``` | Draw the specified extrusion |
 
 ![extrusions](tests/png/extrusions.png)
 
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   1 | ```extrusion(E2020, 80)``` |  Extrusion E2020 x 80mm |
-|   1 | ```extrusion(E2040, 80)``` |  Extrusion E2040 x 80mm |
-|   1 | ```extrusion(E2060, 80)``` |  Extrusion E2060 x 80mm |
-|   1 | ```extrusion(E2080, 80)``` |  Extrusion E2080 x 80mm |
-|   1 | ```extrusion(E3030, 80)``` |  Extrusion E3030 x 80mm |
-|   1 | ```extrusion(E3060, 80)``` |  Extrusion E3060 x 80mm |
-|   1 | ```extrusion(E4040, 80)``` |  Extrusion E4040 x 80mm |
-|   1 | ```extrusion(E4080, 80)``` |  Extrusion E4080 x 80mm |
+|   1 | ```extrusion(E2020, 80, false)``` |  Extrusion E2020 x 80mm |
+|   1 | ```extrusion(E2040, 80, false)``` |  Extrusion E2040 x 80mm |
+|   1 | ```extrusion(E2060, 80, false)``` |  Extrusion E2060 x 80mm |
+|   1 | ```extrusion(E2080, 80, false)``` |  Extrusion E2080 x 80mm |
+|   1 | ```extrusion(E3030, 80, false)``` |  Extrusion E3030 x 80mm |
+|   1 | ```extrusion(E3060, 80, false)``` |  Extrusion E3060 x 80mm |
+|   1 | ```extrusion(E4040, 80, false)``` |  Extrusion E4040 x 80mm |
+|   1 | ```extrusion(E4080, 80, false)``` |  Extrusion E4080 x 80mm |
 
 
 <a href="#top">Top</a>
@@ -1131,13 +1180,15 @@ KP pillow block bearings
 | ---:|:--- |:---|
 |   1 | ```kp_pillow_block(KP000)``` |  KP000 pillow block |
 |   1 | ```kp_pillow_block(KP001)``` |  KP001 pillow block |
-|   1 | ```kp_pillow_block(KP08)``` |  KP08 pillow block |
+|   1 | ```kp_pillow_block(KP08_15)``` |  KP08_15 pillow block |
+|   1 | ```kp_pillow_block(KP08_18)``` |  KP08_18 pillow block |
+|   2 | ```sliding_t_nut(M4_hammer_nut)``` |  Nut M4 hammer |
 |   2 | ```sliding_t_nut(M4_sliding_t_nut)``` |  Nut M4 sliding T |
 |   2 | ```sliding_t_nut(M5_sliding_t_nut)``` |  Nut M5 sliding T |
 |   2 | ```nut(M5_nut, nyloc = undef)``` |  Nut M5 x 4mm  |
-|   2 | ```screw(M4_cap_screw, 10)``` |  Screw M4 cap x 10mm |
+|   4 | ```screw(M4_cap_screw, 10)``` |  Screw M4 cap x 10mm |
 |   4 | ```screw(M5_cap_screw, 12)``` |  Screw M5 cap x 12mm |
-|   2 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
+|   4 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
 |   6 | ```washer(M5_washer)``` |  Washer  M5 x 10mm x 1mm |
 
 
@@ -1763,6 +1814,88 @@ A permanent magnet that can be magnatized and de-magnatized electronically.
 |   1 | ```opengrab()``` |  OpenGrab V3 electro permanent magnet |
 
 
+<a href="#top">Top</a>
+
+---
+<a name="Pcb"></a>
+## Pcb
+PCBs and perfboard with optional components. The shape can be a rectangle with optionally rounded corners or a polygon for odd shapes like Arduino.
+
+
+[vitamins/pcb.scad](vitamins/pcb.scad) Implementation.
+
+[tests/pcb.scad](tests/pcb.scad) Code for this example.
+
+### Properties
+| Function | Description |
+|:--- |:--- |
+| ```hdmi_depth(type)``` | Front to back depth |
+| ```hdmi_height(type)``` | Outside height above the PCB |
+| ```hdmi_height1(type)``` | Inside height at the sides |
+| ```hdmi_height2(type)``` | Inside height in the middle |
+| ```hdmi_thickness(type)``` | Wall thickness of the metal |
+| ```hdmi_width1(type)``` | Inside width at the top |
+| ```hdmi_width2(type)``` | Inside width at the bottom |
+| ```pcb_accessories(type)``` | List of accessories to go on the BOM, SD cards, USB cables, etc. |
+| ```pcb_colour(type)``` | Colour of the subtrate |
+| ```pcb_components(type)``` | List of components |
+| ```pcb_grid(type)``` | Grid if a perfboard |
+| ```pcb_hole_d(type)``` | Mounting hole diameter |
+| ```pcb_holes(type)``` | List of hole positions |
+| ```pcb_land_d(type)``` | Pad around mounting hole |
+| ```pcb_length(type)``` | Length |
+| ```pcb_name(type)``` | Description |
+| ```pcb_parts_on_bom(type)``` | True if the parts should be separate BOM items |
+| ```pcb_polygon(type)``` | Optional outline polygon for odd shaped boards |
+| ```pcb_radius(type)``` | Corner radius |
+| ```pcb_thickness(type)``` | Thickness |
+| ```pcb_width(type)``` | Width |
+
+### Functions
+| Function | Description |
+|:--- |:--- |
+| ```pcb_component_position(type, name, index = 0)``` | Return x y position of specified component |
+| ```pcb_coord(type, p)``` | Convert offsets from the edge to coordinates relative to the centre |
+| ```pcb_grid_pos(type, x, y, z = 0)``` | Returns a pcb grid position |
+| ```pcb_screw(type, cap = hs_cap)``` | Mounting screw type |
+
+### Modules
+| Module | Description |
+|:--- |:--- |
+| ```barrel_jack(cutout = false)``` | Draw barrel power jack |
+| ```buzzer(height, diameter, colour)``` | Draw PCB buzzer with specified height, diameter and color |
+| ```chip(length, width, thickness, colour, cutout = false)``` | Draw a coloured cube to represent a chip, or other rectangular component |
+| ```flat_flex(cutout = false)``` | Draw flat flexistrip connector as used on RPI0 |
+| ```flex(cutout = false)``` | Draw flexistrip connector |
+| ```hdmi(type, cutout = false)``` | Draw HDMI socket |
+| ```jack(cutout = false)``` | Draw 3.5mm jack |
+| ```molex_254(ways)``` | Draw molex header |
+| ```pcb(type)``` | Draw specified PCB |
+| ```pcb_assembly(type, height, thickness)``` | Draw PCB assembly with spaces and fasteners in place |
+| ```pcb_base(type, height, thickness, wall = 2)``` | Generate STL for a base with PCB spacers |
+| ```pcb_component(comp, cutouts = false, angle = undef)``` | Draw pcb component from description |
+| ```pcb_component_position(type, name)``` | Position child at the specified component position |
+| ```pcb_components(type, cutouts = false, angle = undef)``` | Draw list of PCB components on the PCB |
+| ```pcb_cutouts(type, angle = undef)``` | Make cut outs to clear components on a PCB |
+| ```pcb_grid(type, x, y, z = 0)``` | Positions children at specified grid position |
+| ```pcb_screw_positions(type)``` | Positions children at the mounting hole positions |
+| ```pcb_spacer(screw, height, wall = 1.8, taper = 0)``` | Generate STL for PCB spacer |
+| ```rj45(cutout = false)``` | Draw RJ45 Ethernet connector |
+| ```terminal_35(ways, colour = "blue")``` | Draw 3.5mm terminal block |
+| ```uSD(size, cutout = false)``` | Draw uSD socket |
+| ```usb_Ax1(cutout = false)``` | Draw USB type A single socket |
+| ```usb_Ax2(cutout = false)``` | Draw USB type A dual socket |
+| ```usb_B(cutout = false)``` | Draw USB B connector |
+| ```usb_uA(cutout = false)``` | Draw USB micro A connector |
+
+![pcb](tests/png/pcb.png)
+
+### Vitamins
+| Qty | Module call | BOM entry |
+| ---:|:--- |:---|
+|   1 | ```pcb(TestPCB)``` |  Test PCB |
+
+
 <a href="#top">Top</a>
 
 ---
@@ -1832,8 +1965,9 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 | ```pcb_screw_positions(type)``` | Positions children at the mounting hole positions |
 | ```pcb_spacer(screw, height, wall = 1.8, taper = 0)``` | Generate STL for PCB spacer |
 | ```rj45(cutout = false)``` | Draw RJ45 Ethernet connector |
-| ```terminal_35(ways)``` | Draw 3.5mm terminal block |
+| ```terminal_35(ways, colour = "blue")``` | Draw 3.5mm terminal block |
 | ```uSD(size, cutout = false)``` | Draw uSD socket |
+| ```usb_Ax1(cutout = false)``` | Draw USB type A single socket |
 | ```usb_Ax2(cutout = false)``` | Draw USB type A dual socket |
 | ```usb_B(cutout = false)``` | Draw USB B connector |
 | ```usb_uA(cutout = false)``` | Draw USB micro A connector |
@@ -1995,8 +2129,8 @@ Pin headers and sockets, etc.
 | ```idc_transition(type, cols = 5, skip = [], cutout = false)``` | Draw IDC transition header |
 | ```jst_xh_header(type, pin_count, right_angle=false, colour, pin_colour)``` | Draw JST XH connector |
 | ```pin(type, length = undef)``` | Draw a header pin |
-| ```pin_header(type, cols = 1, rows = 1, smt = false, right_angle = false, cutout = false)``` | Draw pin header |
-| ```pin_socket(type, cols = 1, rows = 1, right_angle = false, height = 0, smt = false, cutout = false)``` | Draw pin socket |
+| ```pin_header(type, cols = 1, rows = 1, smt = false, right_angle = false, cutout = false, colour)``` | Draw pin header |
+| ```pin_socket(type, cols = 1, rows = 1, right_angle = false, height = 0, smt = false, cutout = false, colour)``` | Draw pin socket |
 
 ![pin_headers](tests/png/pin_headers.png)
 
@@ -2340,6 +2474,8 @@ Rocker switch. Also used for neon indicator in the same form factor.
 ## Rod
 Steel rods and studding with chamfered ends.
 
+These items are sysmtrical, so by default the origin is in the centre but it can be changed to the bottom.
+
 
 [vitamins/rod.scad](vitamins/rod.scad) Implementation.
 
@@ -2648,8 +2784,8 @@ SK shaft support brackets
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   2 | ```extrusion(E2020, 20)``` |  Extrusion E2020 x 20mm |
-|   2 | ```extrusion(E3030, 20)``` |  Extrusion E3030 x 20mm |
+|   2 | ```extrusion(E2020, 20, false)``` |  Extrusion E2020 x 20mm |
+|   2 | ```extrusion(E3030, 20, false)``` |  Extrusion E3030 x 20mm |
 |   2 | ```sliding_t_nut(M4_hammer_nut)``` |  Nut M4 hammer |
 |   2 | ```sliding_t_nut(M4_sliding_t_nut)``` |  Nut M4 sliding T |
 |   2 | ```sliding_t_nut(M5_sliding_t_nut)``` |  Nut M5 sliding T |
@@ -2751,6 +2887,8 @@ Filament spool models
 ## Springs
 Compression springs. Can be tapered, have open, closed or ground ends. Ground ends will render a lot slower.
 
+By default springs have their origin at the bottom but can be centered.
+
 
 [vitamins/springs.scad](vitamins/springs.scad) Object definitions.
 
@@ -2779,7 +2917,7 @@ Compression springs. Can be tapered, have open, closed or ground ends. Ground en
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```comp_spring(type, l = 0)``` | Draw specified spring, l can be set to specify the compressed length. |
+| ```comp_spring(type, l = 0, center = false)``` | Draw specified spring, l can be set to specify the compressed length. |
 
 ![springs](tests/png/springs.png)
 

tests/extrusion_brackets.scad

@@ -0,0 +1,60 @@
+//
+// NopSCADlib Copyright Chris Palmer 2020
+// 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>
+
+include <../vitamins/extrusion_brackets.scad>
+include <../vitamins/extrusions.scad>
+include <../vitamins/washers.scad>
+include <../vitamins/nuts.scad>
+
+module extrusion_brackets() {
+    extrusion_inner_corner_bracket(E20_inner_corner_bracket);
+
+    translate([30, 0])
+        extrusion_inner_corner_bracket(E20_inner_corner_bracket, grub_screws = false);
+
+    translate([60, 0])
+        extrusion_corner_bracket_assembly(E20_corner_bracket);
+
+    eWidth = extrusion_width(E2020);
+
+    translate([0, 60]) {
+        extrusion_inner_corner_bracket(E20_inner_corner_bracket);
+        translate([-eWidth / 2, 0, 0])
+            rotate([-90, 0, 0])
+                extrusion(E2020, 20);
+        translate([-eWidth, -eWidth / 2, 0])
+            rotate([0, 90, 0])
+                extrusion(E2020, 40);
+    }
+
+    translate([60, 60]) {
+        extrusion_corner_bracket_assembly(E20_corner_bracket);
+        translate([-eWidth / 2, 0, 0])
+            rotate([-90, 0, 0])
+                extrusion(E2020, 30);
+        translate([-eWidth, -eWidth / 2, 0])
+            rotate([0, 90, 0])
+                extrusion(E2020, 50);
+    }
+}
+
+if($preview)
+    let($show_threads = true)
+        extrusion_brackets();

tests/kp_pillow_blocks.scad

@@ -23,12 +23,12 @@ include <../vitamins/kp_pillow_blocks.scad>
 include <../vitamins/nuts.scad>
 
 module kp_pillow_blocks() {
-    screws = [M4_cap_screw, M5_cap_screw, M5_cap_screw];
-    nuts = [M4_sliding_t_nut, M5_sliding_t_nut, M5_nut];
+    screws = [M4_cap_screw, M4_cap_screw, M5_cap_screw, M5_cap_screw];
+    nuts = [M4_sliding_t_nut, M4_hammer_nut, M5_sliding_t_nut, M5_nut];
+    assert(len(screws) == len(kp_pillow_blocks) && len(nuts) == len(kp_pillow_blocks));
     layout([for(k = kp_pillow_blocks) 2 * kp_size(k)[1]])
         kp_pillow_block_assembly(kp_pillow_blocks[$i], screw_type = screws[$i], nut_type = nuts[$i]);
 }
 
 if($preview)
     kp_pillow_blocks();
-

tests/pcb.scad

@@ -0,0 +1,109 @@
+//
+// NopSCADlib Copyright Chris Palmer 2020
+// 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 <../vitamins/pcb.scad>
+include <../vitamins/microswitches.scad>
+include <../vitamins/d_connectors.scad>
+
+gt_5x17 = ["gt_5x17",    5,   10,   17, 5,   11, 0.4,  9,   2,1.5,     1,  3,   6,     0,  0,   0];
+gt_5x11 = ["gt_5x11",    5,    8,   11, 5,    7, 0.4,  7,   1.5,1.5,   1,2.5,   6,     0,  0,   0];
+
+TMC2130HeatSinkColor = "DeepSkyBlue";
+TMC2130 = ["TMC2130", "TMC2130",
+    20, 14, 1.6, 0, 3, 0, "white", false, [],
+    [
+        [  10,  1,  0, "-2p54header", 8, 1 ,undef, "blue" ],
+        [  10, 13,  0, "-2p54header", 8, 1],
+        [  12,  7,  0, "-chip", 6, 4, 1, grey20 ],
+        // mock up a heat sink
+        [  10,  7,  0, "block", 9, 9,  2, TMC2130HeatSinkColor ],
+        [  10, 11,  0, "block", 9, 1, 11, TMC2130HeatSinkColor ],
+        [  10,  9,  0, "block", 9, 1, 11, TMC2130HeatSinkColor ],
+        [  10,  7,  0, "block", 9, 1, 11, TMC2130HeatSinkColor ],
+        [  10,  5,  0, "block", 9, 1, 11, TMC2130HeatSinkColor ],
+        [  10,  3,  0, "block", 9, 1, 11, TMC2130HeatSinkColor ],
+    ],
+    []
+];
+
+test_pcb = ["TestPCB", "Test PCB",
+    50, 500, 1.6, // length, width, thickness
+    3,      // Corner radius
+    2.75,   // Mounting hole diameter
+    6,      // Pad around mounting hole
+    "green",// Color
+    false,  // True if the parts should be separate BOM items
+    // hole offsets
+    [ [3, 3], [3, -3], [-3, 3], [-3, -3] ],
+    // components
+    [
+        [ 10,  10,   0, "2p54header", 4, 1],
+        [ 25,  10,   0, "2p54header", 5, 1, undef, "blue" ],
+        [ 10,  20,   0, "2p54boxhdr", 4, 2],
+        [ 10,  30,   0, "2p54socket", 6, 1],
+        [ 25,  30,   0, "2p54socket", 4, 1, undef, undef, undef, "red" ],
+        [ 10,  40,   0, "chip", 10, 5, 1, grey20],
+        [ 10,  60, 180, "rj45"],
+        [  8,  80, 180, "usb_A"],
+        [  8, 100, 180, "usb_Ax2"],
+        [  3, 120, 180, "usb_uA"],
+        [  8, 140, 180, "usb_B"],
+        [ 10, 160,   0, "buzzer"],
+        [ 25, 160,   0, "buzzer", 4.5, 8.5],
+        [ 10, 175,   0, "potentiometer"],
+        [ 30, 175,   0, "potentiometer", 7, 8],
+        [  8, 190, 180, "jack"],
+        [  6, 200, 180, "barrel_jack"],
+        [  5, 220, 180, "hdmi"],
+        [  3, 240, 180, "mini_hdmi"],
+        [ 10, 250,   0, "flex"],
+        [ 10, 265,   0, "flat_flex"],
+        [ 10, 280,   0, "D_plug", DCONN9],
+        [ 10, 300,   0, "molex_hdr", 2],
+        [ 10, 310,   0, "jst_xh", 2],
+        [ 10, 320, 180, "term254", 3],
+        [ 20, 320, 180, "term254", 3, undef, grey20],
+        [ 10, 340, 180, "gterm35", 4, [1,2]],
+        [ 20, 340, 180, "gterm35", 4, [1,2], "red"],
+        [ 30, 340, 180, "gterm", gt_5x11, 3],
+        [ 10, 360, 180, "gterm635", 2],
+        [ 25, 360, 180, "gterm635", 2, undef, "blue"],
+        [ 40, 360, 180, "gterm", gt_5x17, 2, undef, grey20],
+        [ 40, 340, 180, "gterm", gt_5x17, 3, [1], "red"],
+        [ 10, 380, 180, "term35", 4],
+        [ 20, 380, 180, "term35", 3, "lime"],
+        [ 10, 400,   0, "transition", 5],
+        [ 10, 410,   0, "block", 10, 5, 8, "orange"],
+        [ 10, 420,   0, "button_6mm"],
+        [ 10, 435,   0, "microswitch", small_microswitch],
+        [ 12, 450,   0, "pcb", 11, TMC2130 ],
+        [ 12, 456,   0, "2p54socket", 8, 1 ],
+        [ 12, 444,   0, "2p54socket", 8, 1, undef, undef, undef, "red" ],
+        [ 10, 470,   0, "standoff",  5, 4.5, 12.5, 2.54],
+        [  6, 480, 180, "uSD", [12, 11.5, 1.4]],
+    ],
+    // accessories
+    []
+];
+
+
+if($preview)
+    let($show_threads = true)
+        pcb(test_pcb);

vitamins/extrusion.scad

@@ -43,7 +43,7 @@ module extrusion_cross_section(type, cornerHole) {
         fillet = extrusion_fillet(type);
         cornerSize = (width-channelWidth)/2;
         cornerSquare = (width-extrusion_channel_width_internal(type))/2;
-        cornerHoleDiameter =extrusion_corner_hole(type);
+        cornerHoleDiameter = extrusion_corner_hole(type);
 
         translate([-width/2,-width/2]) {
             difference() {
@@ -57,7 +57,7 @@ module extrusion_cross_section(type, cornerHole) {
                     translate([fillet,fillet])
                         square([cornerSquare-fillet,cornerSquare-fillet]);
                 }
-                if(cornerHole)
+                if(cornerHole && cornerHoleDiameter > 0)
                     translate([cornerSquare/2,cornerSquare/2])
                         circle(d=cornerHoleDiameter);
             }
@@ -117,12 +117,12 @@ module extrusion_cross_section(type, cornerHole) {
                 extrusion_center_section(type);
 }
 
-module extrusion(type, length, cornerHole = false) { //! Draw the specified extrusion
+module extrusion(type, length, center = false, cornerHole = false) { //! Draw the specified extrusion
 
-    vitamin(str("extrusion(", type[0], ", ", length, "): Extrusion ", type[0], " x ", length, "mm"));
+    vitamin(str("extrusion(", type[0], ", ", length, ", ", center, "): Extrusion ", type[0], " x ", length, "mm"));
 
     color(grey90)
-        linear_extrude(height = length)
+        linear_extrude(length, center = center)
             extrusion_cross_section(type, cornerHole);
 }
 

vitamins/extrusion_bracket.scad

@@ -0,0 +1,139 @@
+//
+// NopSCADlib Copyright Chris Palmer 2020
+// 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/>.
+//
+
+//! Brackets for joining extrusions at a corner.
+
+include <NopSCADlib/core.scad>
+include <screws.scad>
+include <nuts.scad>
+
+function extrusion_inner_corner_bracket_size(type)             = type[1]; //! Size of inner bracket
+
+module extrusion_inner_corner_bracket(type, grub_screws = true) { //! Inner corner bracket for extrusion
+    vitamin(str("extrusion_inner_corner_bracket(", type[0], ", ", grub_screws, "): Extrusion inner corner bracket ", type[1].z));
+
+    size = extrusion_inner_corner_bracket_size(type);
+    armLength = size.x;
+    bottomTabOffset = 4;
+    topTabOffset = 10;
+    sizeBottom = [armLength - bottomTabOffset, 6, size.z];
+    sizeTop = [armLength - topTabOffset, 6, size.z];
+    tabSizeY1 = 10;
+    tabSizeY2 = 6;
+    tabSizeZ = 3.25;
+    holeRadius = M4_tap_radius;
+
+    translate([-size.z - 0.75, -size.z - 0.75, 0])
+        rotate([-90, 0, 0]) {
+            color("silver") {
+                translate([(armLength + bottomTabOffset) / 2, 0, tabSizeZ])
+                    rotate([0, 180, 0])
+                        extrusionSlidingNut(sizeBottom, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius, (bottomTabOffset - armLength) / 2 + 5);
+                translate([tabSizeZ, 0, (armLength + topTabOffset) / 2])
+                    rotate([0, -90, 0])
+                        extrusionSlidingNut(sizeTop, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius,-(topTabOffset - armLength) / 2 - 5);
+                translate([0, -size.z / 2, 0]) {
+                    cube([bottomTabOffset, size.z, size.z]);
+                    cube([size.z, size.z, topTabOffset]);
+                }
+            }
+            if(grub_screws)
+                not_on_bom() no_explode() {
+                    grubScrewLength = 6;
+                    for(angle = [[0, 0, 0], [0, -90, 180]])
+                        rotate(angle)
+                            translate([armLength - 5, 0, size.z])
+                                screw(M3_grub_screw, grubScrewLength);
+                }
+        }
+}
+
+function extrusion_corner_bracket_size(type)             = type[1]; //! Size of bracket
+function extrusion_corner_bracket_base_thickness(type)   = type[2]; //! Thickness of base of bracket
+function extrusion_corner_bracket_side_thickness(type)   = type[3]; //! Thickness of side of bracket
+function extrusion_corner_bracket_hole_offset(type)      = type[4]; //! Hole offset from corner
+
+module extrusion_corner_bracket(type) { //! Corner bracket for extrusion
+echo(type=type);
+    vitamin(str("extrusion_corner_bracket(", type[0], "): Extrusion corner bracket ", type[1].z));
+
+    eSize = extrusion_corner_bracket_size(type).z;
+    cbSize = extrusion_corner_bracket_size(type).x;
+    baseThickness = extrusion_corner_bracket_base_thickness(type);
+
+    module base() {
+        linear_extrude(baseThickness)
+            difference() {
+                translate([0, -eSize / 2, 0])
+                    square([cbSize, eSize]);
+                hull() {
+                    translate([extrusion_corner_bracket_hole_offset(type) + 1.5, 0, 0])
+                        circle(r = M5_clearance_radius);
+                    translate([extrusion_corner_bracket_hole_offset(type) - 1.5, 0, 0])
+                        circle(r = M5_clearance_radius);
+                }
+            }
+    }
+
+    color("silver") {
+        rotate([90, 0, 90])
+            base();
+        translate([0, baseThickness, 0])
+            rotate([90, 0, 0])
+                base();
+        sideThickness = extrusion_corner_bracket_side_thickness(type);
+        for(z = [-eSize / 2, eSize / 2 - sideThickness]) {
+            translate_z(z) {
+                right_triangle(cbSize, cbSize, sideThickness, center = false);
+                cube([5, cbSize, sideThickness]);
+                cube([cbSize, 5, sideThickness]);
+            }
+        }
+    }
+}
+
+module extrusion_corner_bracket_hole_positions(type) { //! Place children at hole positions
+    for(angle = [ [0, 90, 0], [-90, -90, 0] ])
+        rotate(angle)
+            translate([0, extrusion_corner_bracket_hole_offset(type), extrusion_corner_bracket_base_thickness(type)])
+                children();
+}
+
+module extrusion_corner_bracket_assembly(type, part_thickness = 2, screw_type = M4_cap_screw, nut_type = M4_sliding_t_nut, max_screw_depth = 6) { //! Assembly with fasteners in place
+    extrusion_corner_bracket(type);
+
+    screw_washer_thickness = washer_thickness(screw_washer(screw_type));
+    nut_washer_type = nut_washer(nut_type);
+    nut_washer_thickness = nut_washer_type ? washer_thickness(nut_washer_type) : 0;
+
+    nut_offset = extrusion_corner_bracket_base_thickness(type) + part_thickness;
+    screw_length = max_screw_depth ? screw_shorter_than(extrusion_corner_bracket_base_thickness(type) + screw_washer_thickness + max_screw_depth)
+                                   : screw_longer_than(nut_offset + screw_washer_thickness + nut_washer_thickness + nut_thickness(nut_type));
+
+    extrusion_corner_bracket_hole_positions(type) {
+        screw_and_washer(screw_type, screw_length);
+        translate_z(-nut_offset)
+            vflip()
+                if(nut_washer_type)
+                    nut_and_washer(nut_type);
+                else
+                    rotate(90)
+                        sliding_t_nut(nut_type);
+    }
+}

vitamins/extrusion_brackets.scad

@@ -0,0 +1,29 @@
+//
+// NopSCADlib Copyright Chris Palmer 2020
+// 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/>.
+//
+//
+// Extrusion brackets
+//
+
+E20_inner_corner_bracket  = [ "E20_inner_corner_bracket", [25, 25, 4.5] ];
+
+E20_corner_bracket = [ "E20_corner_bracket", [28, 28, 20], 2, 3, 19.5];
+
+
+use <extrusion_bracket.scad>
+

vitamins/extrusions.scad

@@ -20,10 +20,10 @@
 // Extrusion
 //
 //                   W   H    d1   d2   s  cw   cwi    t  st  f
-E2020  = [ "E2020", 20, 20,  4.2,   0,  8,  6, 12.0,   2,  2, 1 ];
-E2040  = [ "E2040", 20, 40,  4.2,   0,  8,  6, 12.0,   2,  2, 1 ];
-E2060  = [ "E2060", 20, 60,  4.2,   0,  8,  6, 12.0,   2,  2, 1 ];
-E2080  = [ "E2080", 20, 80,  4.2,   0,  8,  6, 12.0,   2,  2, 1 ];
+E2020  = [ "E2020", 20, 20,  4.2,   3,  8,  6, 12.0,   2,  2, 1 ];
+E2040  = [ "E2040", 20, 40,  4.2,   3,  8,  6, 12.0,   2,  2, 1 ];
+E2060  = [ "E2060", 20, 60,  4.2,   3,  8,  6, 12.0,   2,  2, 1 ];
+E2080  = [ "E2080", 20, 80,  4.2,   3,  8,  6, 12.0,   2,  2, 1 ];
 E3030  = [ "E3030", 30, 30,  6.8, 4.2, 12,  8, 16.5,   2,  2, 1 ];
 E3060  = [ "E3060", 30, 60,  6.8, 4.2, 12,  8, 16.5,   2,  2, 1 ];
 E4040  = [ "E4040", 40, 40, 10.5, 6.0, 15, 10, 20.0, 5.5,  3, 1 ];

vitamins/kp_pillow_blocks.scad

@@ -24,11 +24,12 @@
 include <screws.scad>
 include <ball_bearings.scad>
 
-//                 d   H   L   J   A    N  H1  H0     K  S  b   bolthole             bearing
-KP08 =  ["KP08",   8, 18, 55, 42, 13, 4.5,  5, 29,  0.0, 0, 22, M4_clearance_radius, BB608];
-KP000 = ["KP000", 10, 18, 67, 53, 16, 7.0,  6, 35, 14.0, 4, 30, M6_clearance_radius, BB6200];
-KP001 = ["KP001", 12, 19, 71, 56, 16, 7.0,  6, 38, 14.5, 4, 32, M6_clearance_radius, BB6201];
+//                      d   H   L   J   A    N  H1  H0     K  S  b   bolthole             bearing
+KP08_15 = ["KP08_15",   8, 15, 55, 42, 13, 4.5,  5, 29,  0.0, 0, 22, M4_clearance_radius, BB608];
+KP08_18 = ["KP08_18",   8, 18, 55, 42, 13, 4.5,  5, 29,  0.0, 0, 22, M4_clearance_radius, BB608];
+KP000 =   ["KP000",    10, 18, 67, 53, 16, 7.0,  6, 35, 14.0, 4, 30, M6_clearance_radius, BB6200];
+KP001 =   ["KP001",    12, 19, 71, 56, 16, 7.0,  6, 38, 14.5, 4, 32, M6_clearance_radius, BB6201];
 
-kp_pillow_blocks = [KP08,  KP000, KP001];
+kp_pillow_blocks = [KP08_15, KP08_18, KP000, KP001];
 
 use <kp_pillow_block.scad>

vitamins/pcb.scad

@@ -31,6 +31,7 @@ include <microswitches.scad>
 
 use <../utils/rounded_cylinder.scad>
 use <../utils/dogbones.scad>
+use <../utils/thread.scad>
 use <../utils/tube.scad>
 use <d_connector.scad>
 
@@ -79,16 +80,21 @@ module chip(length, width, thickness, colour, cutout = false) //! Draw a coloure
         color(colour)
             translate_z(thickness / 2) cube([length, width, thickness], center = true);
 
+module usb_Ax1(cutout = false) { //! Draw USB type A single socket
+    usb_A(h = 6.5, v_flange_l = 4.5, bar = 0, cutout = cutout);
+}
+
 module usb_Ax2(cutout = false) { //! Draw USB type A dual socket
+    usb_A(h = 15.6, v_flange_l = 12.15, bar = 3.4, cutout = cutout);
+}
+
+module usb_A(h, v_flange_l, bar, cutout) {
     l = 17;
     w = 13.25;
-    h = 15.6;
     flange_t = 0.4;
     h_flange_h = 0.8;
     h_flange_l = 11;
     v_flange_h = 1;
-    v_flange_l = 12.15;
-    bar = 3.4;
     socket_h = (h - 2 * flange_t - bar) / 2;
 
     translate_z(h / 2)
@@ -203,11 +209,32 @@ module jack(cutout = false) { //! Draw 3.5mm jack
 
 module buzzer(height, diameter, colour) { //! Draw PCB buzzer with specified height, diameter and color
     color (colour)
-        tube(or = diameter / 2, ir = height > 5 ? 1 : 0.75, h = height);
+        tube(or = diameter / 2, ir = height > 5 ? 1 : 0.75, h = height, center = false);
     color("white")
         cylinder(d = 2, h = max(height - 3 , 0.5));
 }
 
+module potentiometer(h1, h2) {
+    color("silver") {
+        baseSize = [12, 11, 6];
+        translate_z(baseSize.z / 2)
+            cube(baseSize, center = true);
+        translate_z(baseSize.z) {
+            cylinder(d = 5, h = h1 - 0.5);
+            if (show_threads)
+                male_metric_thread(6, metric_coarse_pitch(5), length = h1 - 0.5, center = false);
+        }
+        translate_z(baseSize.z + h1 - 0.5)
+            cylinder(d = 3, h = 0.5);
+        translate_z(baseSize.z + h1)
+            linear_extrude(h2)
+                difference() {
+                    circle(d=5);
+                    square([0.75,5], center = true);
+                }
+    }
+}
+
 function hdmi_depth(type)     = type[2]; //! Front to back depth
 function hdmi_width1(type)    = type[3]; //! Inside width at the top
 function hdmi_width2(type)    = type[4]; //! Inside width at the bottom
@@ -574,7 +601,7 @@ module flat_flex(cutout = false) { //! Draw flat flexistrip connector as used on
     }
 }
 
-module terminal_35(ways) { //! Draw 3.5mm terminal block
+module terminal_35(ways, colour = "blue") { //! Draw 3.5mm terminal block
     vitamin(str("terminal_35(", ways, "): Terminal block ", ways, " way 3.5mm"));
     pitch = 3.5;
     width = ways * pitch;
@@ -592,7 +619,7 @@ module terminal_35(ways) { //! Draw 3.5mm terminal block
 
     module single() {
         screw_r = 1;
-        color("blue") {
+        color(colour) {
             rotate([90, 0, 0])
                 linear_extrude(height = pitch, center = true)
                     polygon(points = [
@@ -710,15 +737,17 @@ module pcb_component(comp, cutouts = false, angle = undef) { //! Draw pcb compon
     function show(comp, part) = (comp[3] == part || comp[3] == str("-",part)) && (!cutouts || angle == undef || angle == comp.z);
     function param(n, default = 0) = len(comp) > n ? comp[n] : default;
     rotate(comp.z) {
-        if(show(comp, "2p54header")) pin_header(2p54header, comp[4], comp[5], param(6), cutouts);
+        if(show(comp, "2p54header")) pin_header(2p54header, comp[4], comp[5], param(6), cutouts, colour = param(7, undef));
         if(show(comp, "2p54boxhdr")) box_header(2p54header, comp[4], comp[5], param(6), cutouts);
-        if(show(comp, "2p54socket")) pin_socket(2p54header, comp[4], comp[5], param(6, false), param(7), param(8, false), cutouts);
+        if(show(comp, "2p54socket")) pin_socket(2p54header, comp[4], comp[5], param(6, false), param(7), param(8, false), cutouts, param(9, undef));
         if(show(comp, "chip")) chip(comp[4], comp[5], comp[6], param(7, grey30), cutouts);
         if(show(comp, "rj45")) rj45(cutouts);
+        if(show(comp, "usb_A")) usb_Ax1(cutouts);
         if(show(comp, "usb_Ax2")) usb_Ax2(cutouts);
         if(show(comp, "usb_uA")) usb_uA(cutouts);
         if(show(comp, "usb_B")) usb_B(cutouts);
         if(show(comp, "buzzer")) buzzer(param(4, 9), param(5, 12), param(6, grey20));
+        if(show(comp, "potentiometer")) potentiometer(param(4, 5), param(5, 9));
         if(show(comp, "jack")) jack(cutouts);
         if(show(comp, "barrel_jack")) barrel_jack(cutouts);
         if(show(comp, "hdmi")) hdmi(hdmi_full, cutouts);
@@ -728,10 +757,11 @@ module pcb_component(comp, cutouts = false, angle = undef) { //! Draw pcb compon
         if(show(comp, "D_plug")) if(!cutouts) translate_z(d_pcb_offset(comp[4])) d_plug(comp[4], pcb = true);
         if(show(comp, "molex_hdr")) if(!cutouts) molex_254(comp[4]);
         if(show(comp, "jst_xh")) if(!cutouts) jst_xh_header(jst_xh_header, comp[4], param(5, false), param(6, "white"), param(7, undef));
-        if(show(comp, "term254")) if(!cutouts) green_terminal(gt_2p54,comp[4], comp[5]);
-        if(show(comp, "gterm35")) if(!cutouts) green_terminal(gt_3p5, comp[4], comp[5]);
-        if(show(comp, "gterm635")) if(!cutouts) green_terminal(gt_6p35, comp[4], comp[5]);
-        if(show(comp, "term35")) if(!cutouts) terminal_35(comp[4]);
+        if(show(comp, "term254")) if(!cutouts) green_terminal(gt_2p54,comp[4], comp[5], param(6,"lime"));
+        if(show(comp, "gterm")) if(!cutouts) green_terminal(comp[4], comp[5], comp[6], param(7,"lime"));
+        if(show(comp, "gterm35")) if(!cutouts) green_terminal(gt_3p5, comp[4], comp[5], param(6,"lime"));
+        if(show(comp, "gterm635")) if(!cutouts) green_terminal(gt_6p35, comp[4], comp[5], param(6,"lime"));
+        if(show(comp, "term35")) if(!cutouts) terminal_35(comp[4], param(5,"blue"));
         if(show(comp, "transition")) if(!cutouts) idc_transition(2p54header, comp[4], comp[5]);
         if(show(comp, "block"))
             color(comp[7]) if(!cutouts) translate_z(comp[6] / 2) cube([comp[4], comp[5], comp[6]], center = true);

vitamins/pin_header.scad

@@ -43,8 +43,9 @@ module pin(type, length = undef) { //! Draw a header pin
             }
 }
 
-module pin_header(type, cols = 1, rows = 1, smt = false, right_angle = false, cutout = false) { //! Draw pin header
+module pin_header(type, cols = 1, rows = 1, smt = false, right_angle = false, cutout = false, colour) { //! Draw pin header
     pitch =  hdr_pitch(type);
+    base_colour = colour ? colour : hdr_base_colour(type);
     h = pitch;
     ra_offset = 2.4;
     width = pitch * rows;
@@ -79,7 +80,7 @@ module pin_header(type, cols = 1, rows = 1, smt = false, right_angle = false, cu
             }
             translate([0, right_angle ? -ra_offset - pitch / 2 : 0, right_angle ? width / 2 : 0])
                 rotate([right_angle ? 90 : 0, 0, 0])
-                    color(hdr_base_colour(type))
+                    color(base_colour)
                         linear_extrude(height = h)
                             for(x = [0 : cols - 1], y = [0 : rows - 1])
                                 translate([pitch * (x - (cols - 1) / 2), pitch * (y - (rows - 1) / 2), pitch / 2])
@@ -160,18 +161,19 @@ module idc_transition(type, cols = 5, skip = [], cutout = false) { //! Draw IDC
     }
 }
 
-module pin_socket(type, cols = 1, rows = 1, right_angle = false, height = 0, smt = false, cutout = false) { //! Draw pin socket
+module pin_socket(type, cols = 1, rows = 1, right_angle = false, height = 0, smt = false, cutout = false, colour) { //! Draw pin socket
     pitch = hdr_pitch(type);
     length = pitch * cols + 0.5;
     width = pitch * rows - 0.08;
     depth = height ? height : hdr_socket_depth(type);
+    base_colour = colour ? colour : hdr_base_colour(type);
     ra_offset = 1.5;
     if(cutout)
         ;
     else {
         vitamin(str("pin_socket(", type[0], ", ", cols, ", ", rows, arg(right_angle, false, "right_angle"), arg(height, 0, "height"), arg(smt, false, "smt"),
                                "): Pin socket ", cols, " x ", rows, right_angle ? " right_angle" : ""));
-        color(hdr_base_colour(type))
+        color(base_colour)
             translate([0, right_angle ? -ra_offset - pitch / 2 : 0, right_angle ? width / 2 : 0])
                 rotate([right_angle ? 90 : 0, 0, 0])
                     translate_z(depth / 2)

vitamins/rod.scad

@@ -19,6 +19,8 @@
 
 //
 //! Steel rods and studding with chamfered ends.
+//!
+//! These items are sysmtrical, so by default the origin is in the centre but it can be changed to the bottom.
 //
 include <../core.scad>
 use <../utils/thread.scad>

vitamins/spring.scad

@@ -19,6 +19,8 @@
 
 //
 //! Compression springs. Can be tapered, have open, closed or ground ends. Ground ends will render a lot slower.
+//!
+//! By default springs have their origin at the bottom but can be centered.
 //
 include <../core.scad>
 
@@ -64,7 +66,7 @@ function comp_spring(type, l = 0) = //! Calculate the mesh for spring
         profile = circle_points(wire_d / 2 - eps, $fn = 16)
        ) concat(type, [concat(sweep(path, profile), [l])]);
 
-module comp_spring(type, l = 0) { //! Draw specified spring, l can be set to specify the compressed length.
+module comp_spring(type, l = 0, center = false) { //! Draw specified spring, l can be set to specify the compressed length.
     length = spring_length(type);
     closed = spring_closed(type);
     od = spring_od(type);
@@ -79,14 +81,17 @@ module comp_spring(type, l = 0) { //! Draw specified spring, l can be set to spe
 
     mesh = len(type) > 9 ? spring_mesh(type) : spring_mesh(comp_spring(type, l));
     assert(l == mesh[2], "can't change the length of a pre-generated spring");
-    color(spring_colour(type))
-        if(ground)
-            clip(zmin = 0, zmax = h)
+    len = l ? l : length;
+    translate_z(center ? - len / 2 : 0) {
+        color(spring_colour(type))
+            if(ground)
+                clip(zmin = 0, zmax = h)
+                    polyhedron(mesh[0], mesh[1]);
+            else
                 polyhedron(mesh[0], mesh[1]);
-        else
-            polyhedron(mesh[0], mesh[1]);
 
-    if($children)
-        translate_z(l)
-            children();
+        if($children)
+            translate_z(len)
+                children();
+    }
 }