Merge branch 'martinbudden-rocker_color'

Added a mechanism for tests.py and views.py to have command line options.

.gitattributes

@@ -0,0 +1,16 @@
+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto eol=lf
+
+# Declare text files that are normalized and converted on checkout.
+*.scad text
+*.py   text
+*.md   text
+
+# Handle Windows batch and command files 
+*.{bat,[bB][aA][tT]} text eol=crlf
+*.{cmd,[cC][mM][dD]} text eol=crlf
+
+# Denote files that are binary and should not be modified.
+*.png binary
+*.jpg binary
+

.gitignore

@@ -7,6 +7,7 @@ tests/bom/
 *.log
 *.html
 bounds.json
+options.json
 times.txt
 *_diff.png
 *.echo

docs/usage.md

@@ -26,7 +26,7 @@ OpenSCAD has to be setup to find libraries by setting the ```OPENSCADPATH``` env
 in the directory it points to. This can be done with ```git clone https://github.com/nophead/NopSCADlib.git``` while in that directory or, if you don't want to use GIT,
 by downloading https://github.com/nophead/NopSCADlib/archive/master.zip and unzipping it to a directory called NopSCADlib.
 
-The ```NopSCADlib/scripts``` directory needs to be added to the executable search path.
+The ```NopSCADlib/scripts``` directory needs to be added to the executable search path, ```PATH``` on Windows and ```path``` on Linux and Mac.
 
 The installation can be tested by opening ```NopSCADlib/libtest.scad``` in the OpenSCAD GUI. It should render all the objects in the library in about 1 minute.
 

global_defs.scad

@@ -39,6 +39,7 @@ pp2_colour      = is_undef($pp2_colour)      ? "red"  : $pp2_colour;      // pri
 pp3_colour      = is_undef($pp3_colour)      ? "blue" : $pp3_colour;      // printed part colour 3
 pp4_colour      = is_undef($pp4_colour)      ? "darkorange" : $pp4_colour;// printed part colour 4
 show_rays       = is_undef($show_rays)       ? false  : $show_rays;       // show camera sight lines and light direction
+show_threads    = is_undef($show_threads)    ? false  : $show_threads;    // show screw threads
 
 // Minimum wall is about two filaments wide but we extrude it closer to get better bonding
 squeezed_wall = $preview ? 2 * extrusion_width - layer_height * (1 - PI / 4)
@@ -59,7 +60,8 @@ grey60                          = [0.6, 0.6, 0.6];
 grey70                          = [0.7, 0.7, 0.7];
 grey80                          = [0.8, 0.8, 0.8];
 grey90                          = [0.9, 0.9, 0.9];
-brass                           = "gold";
+brass                           = [255/255, 215/255, 0/255];
+silver                          = [0.75, 0.75, 0.75];
 
 /*
  * Enums

lib.scad

@@ -62,6 +62,7 @@ include <vitamins/spools.scad>
 include <vitamins/mains_sockets.scad>
 include <vitamins/ldrs.scad>
 include <vitamins/geared_steppers.scad>
+include <vitamins/extrusions.scad>
 
 use <vitamins/jack.scad>
 use <vitamins/meter.scad>
@@ -90,3 +91,4 @@ use <utils/layout.scad>
 use <utils/round.scad>
 use <utils/offset.scad>
 use <utils/sector.scad>
+use <utils/thread.scad>

libtest.scad

@@ -32,6 +32,7 @@ use <tests/cable_strips.scad>
 use <tests/components.scad>
 use <tests/d_connectors.scad>
 use <tests/displays.scad>
+use <tests/extrusions.scad>
 use <tests/fans.scad>
 use <tests/fuseholder.scad>
 use <tests/geared_steppers.scad>
@@ -91,6 +92,7 @@ use <tests/strap_handle.scad>
 use <tests/ssr_shroud.scad>
 use <tests/psu_shroud.scad>
 use <tests/flat_hinge.scad>
+use <tests/pcb_mount.scad>
 
 x5 = 800;
 
@@ -134,13 +136,13 @@ translate([x5, cable_grommets_y + 250])
 translate([900, 600])
     box_test();
 
-translate([850, 1170])
+translate([850, 1260])
     bbox_test();
 
 x0 = 0;
 inserts_y = 0;
 nuts_y = inserts_y + 20;
-washers_y = nuts_y + 60;
+washers_y = nuts_y + 100;
 screws_y = washers_y + 120;
 o_rings_y = screws_y + 130;
 springs_y = o_rings_y + 20;
@@ -151,7 +153,7 @@ leadnuts_y = pillars_y + 40;
 pulleys_y = leadnuts_y +40;
 hot_ends_y = pulleys_y + 60;
 linear_bearings_y = hot_ends_y + 50;
-sheets_y = linear_bearings_y + 50;
+sheets_y = linear_bearings_y + 100;
 pcbs_y = sheets_y + 40;
 displays_y = pcbs_y + 150;
 fans_y = displays_y + 100;
@@ -202,6 +204,10 @@ translate([x0, linear_bearings_y]) {
     rods();
 }
 
+translate([x0+150, linear_bearings_y+30]) {
+    extrusions();
+}
+
 translate([x0 + 10, hot_ends_y])
     hot_ends();
 
@@ -248,7 +254,7 @@ buttons_y = spades_y + 40;
 jacks_y = buttons_y + 40;
 microswitches_y = jacks_y + 40;
 rockers_y = microswitches_y + 40;
-toggles_y = rockers_y + 40;
+toggles_y = rockers_y + 60;
 components_y = toggles_y + 40;
 
 translate([x2, leds_y])
@@ -304,6 +310,9 @@ translate([x3, veroboard_y])
 translate([x3 + 70, veroboard_y + 30])
     geared_steppers();
 
+translate([x3 + 140, veroboard_y + 20])
+    pcb_mounts();
+
 translate([x3, d_connectors_y])
     d_connectors();
 

printed/butt_box.scad

@@ -50,6 +50,10 @@ function bbox_name(type)       = type[8] ? type[8] : "bbox"; //! Optional name i
 function bbox_skip_blocks(type)= type[9] ? type[9] : [];  //! List of fixing blocks to skip, used to allow a hinged panel for example
 function star_washers(type)    = type[10] ? type[10] : is_undef(type[10]); //! Set to false to remove 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
+    2 * (w * d + w * h + d * h) / 1000000;
+
 module bbox_shelf_blank(type) { //! 2D template for a shelf
     dxf(str(bbox_name(type), "_shelf"));
 
@@ -165,7 +169,7 @@ module bbox_right_blank(type, sheet = false) { //! 2D template for the right sid
     }
 }
 
-module bbox_front_blank(type, sheet = false) { //! 2D template for the front
+module bbox_front_blank(type, sheet = false, width = 0) { //! 2D template for the front
     dxf(str(bbox_name(type), "_front"));
 
     t = sheet_thickness(bbox_sheets(type));
@@ -174,7 +178,7 @@ module bbox_front_blank(type, sheet = false) { //! 2D template for the front
 
     difference() {
         translate([0, (bt - bb) / 2])
-            sheet_2D(subst_sheet(type, sheet), bbox_width(type) + 2 * t, bbox_height(type) + bb + bt);
+            sheet_2D(subst_sheet(type, sheet), max(bbox_width(type) + 2 * t, width), bbox_height(type) + bb + bt);
 
         drill_holes(type, rotate([-90, 0, 0]) * translate([0, bbox_depth(type) / 2]));
     }
@@ -205,7 +209,7 @@ module _bbox_assembly(type, top = true, base = true, left = true, right = true,
     width = bbox_width(type);
     depth = bbox_depth(type);
     height = bbox_height(type);
-    echo("Box:", width, depth, height);
+    echo("Box:", width, depth, height, volume = bbox_volume(type), area = bbox_area(type));
 
     t = sheet_thickness(bbox_sheets(type));
     bt = sheet_thickness(bbox_base_sheet(type));

printed/cable_grommets.scad

@@ -195,12 +195,15 @@ module mouse_grommet_assembly(r, thickness)
 module ribbon_grommet_20_3_stl() ribbon_grommet(20, 3);
 module mouse_grommet_15_3_stl() mouse_grommet(1.5, 3);
 module mouse_grommet_20_3_stl() mouse_grommet(2, 3);
+module mouse_grommet_25_3_stl() mouse_grommet(2.5, 3);
 module mouse_grommet_30_3_stl() mouse_grommet(3, 3);
 
 module round_grommet_bottom_30_stl() round_grommet_bottom(3);
 module round_grommet_bottom_40_stl() round_grommet_bottom(4);
+module round_grommet_bottom_50_stl() round_grommet_bottom(5);
 module round_grommet_bottom_60_stl() round_grommet_bottom(6);
 
 module round_grommet_top_30_3_stl() round_grommet_top(3, 3);
 module round_grommet_top_40_3_stl() round_grommet_top(4, 3);
+module round_grommet_top_50_3_stl() round_grommet_top(5, 3);
 module round_grommet_top_60_3_stl() round_grommet_top(6, 3);

printed/pcb_mount.scad

@@ -0,0 +1,124 @@
+//
+// NopSCADlib Copyright Chris Palmer 2019
+// 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/>.
+//
+
+//
+//! A frame to mount a PCB by its corners when it has no mounting holes.
+//! The stl must be given a parameterless wrapper in the project that uses it.
+//
+include <../core.scad>
+include <../vitamins/screws.scad>
+use <../vitamins/pcb.scad>
+
+clearance = 0.2;
+min_wall = extrusion_width * 2;
+wall = 2;
+
+overlap = 2;
+
+screw = M3_cap_screw;
+screw_clearance_r = 3.1 / 2;
+pillar_r = corrected_radius(screw_clearance_r) + wall;
+
+function pillar_x_pitch(pcb) = pcb_length(pcb) + 2 * clearance + 2 * (pillar_r - overlap) / sqrt(2); //! x pitch of screw pillars
+function pillar_y_pitch(pcb) = pcb_width(pcb)  + 2 * clearance + 2 * (pillar_r - overlap) / sqrt(2); //! y pitch of screw pillars
+
+function pcb_mount_length(pcb) = pillar_x_pitch(pcb) + 2 * pillar_r; //! Outside length of the mount
+function pcb_mount_width(pcb)  = pillar_y_pitch(pcb) + 2 * pillar_r; //! Outside width of the mount
+
+frame_w = 3;
+frame_t = 2;
+
+washer_thickness = 1.25;
+
+module pcb_mount_screw_positions(pcb) //! Positions of the screws and pillars
+    for(x = [-1, 1], y = [-1, 1])
+        translate([x * pillar_x_pitch(pcb) / 2, y * pillar_y_pitch(pcb) / 2])
+            children();
+
+module pcb_mount_holes(pcb, h = 0)          //! Drill holes for PCB mount
+    pcb_mount_screw_positions(pcb)
+        drill(screw_clearance_radius(screw), h);
+
+module pcb_mount_ring()
+    difference() {
+        circle(pillar_r);
+
+        poly_circle(screw_clearance_r);
+    }
+
+module pcb_mount_washer_stl() //! A plastic washer to clamp a PCB
+    linear_extrude(height = washer_thickness)
+        pcb_mount_ring();
+
+module pcb_mount(pcb, height = 5, washers = true) { //! Make the STL of a pcb mount for the specified PCB.
+    stl(str("pcb_mount_", pcb[0], "_", height));
+
+    y_pitch = pcb_width(pcb) > 4 * pillar_r + 4 ? pillar_r + 1
+                                                : pcb_width(pcb) / 2 + frame_w + 1 + pillar_r;
+
+    if(washers)
+        for(x = [-1, 1], y = [-1, 1])
+            translate([x * (pillar_r + 1), y * y_pitch, 0])
+                pcb_mount_washer_stl();
+
+    for(x = [-1, 1])
+        translate([x * pillar_x_pitch(pcb) / 2, 0, frame_t / 2])
+            cube([frame_w, pillar_y_pitch(pcb) - 2 * wall, frame_t], center = true);
+
+    for(y = [-1, 1])
+        translate([0, y * pillar_y_pitch(pcb) / 2, frame_t / 2])
+            cube([pillar_x_pitch(pcb) - 2 * wall, frame_w, frame_t], center = true);
+
+    pcb_mount_screw_positions(pcb)
+        linear_extrude(height = height)
+            pcb_mount_ring();
+
+    linear_extrude(height = height + pcb_thickness(pcb) - layer_height)
+        difference() {
+            pcb_mount_screw_positions(pcb)
+                pcb_mount_ring();
+
+            square([pcb_length(pcb) + 2 * clearance, pcb_width(pcb) + 2 * clearance], center = true);
+        }
+}
+
+module pcb_mount_assembly(pcb, thickness, height = 5) { //! A PCB mount assembly with fasteners
+    translate_z(height)
+        pcb(pcb);
+
+    color(pp1_colour) pcb_mount(pcb, washers = false);
+
+    washer = screw_washer(screw);
+    nut = screw_nut(screw);
+    t = pcb_thickness(pcb);
+    screw_length = screw_longer_than(height + t + washer_thickness + thickness + washer_thickness(washer) + nut_thickness(nut, true));
+
+    pcb_mount_screw_positions(pcb) {
+        translate_z(height + t) {
+            color(pp2_colour) pcb_mount_washer_stl();
+
+            translate_z(washer_thickness)
+                screw(screw, screw_length);
+        }
+
+        translate_z(-thickness)
+            vflip()
+                nut_and_washer(nut, true);
+    }
+}

printed/screw_knob.scad

@@ -34,7 +34,7 @@ knob_waves = 5;
 knob_height = knob_stem_h + knob_thickness;
 function knob_height() = knob_height;
 
-module screw_knob(screw) { //! Generate the STL foe a knob to fit the specified hex screw
+module screw_knob(screw) { //! Generate the STL for a knob to fit the specified hex screw
     stl(str("screw_knob_M", screw_radius(screw) * 20));
 
     knob_stem_r = nut_trap_radius(screw_nut(screw)) + knob_wall;

readme.md

@@ -28,24 +28,25 @@ See [usage](docs/usage.md) for requirements, installation instructions and a usa
 <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 = "#Fans">Fans</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 = "#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 = "#Fuseholder">Fuseholder</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 = "#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 = "#Geared_steppers">Geared_steppers</a> </td><td> <a href = "#Screws">Screws</a> </td><td> <a href = "#Psu_shroud">Psu_shroud</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 = "#Pcb_mount">Pcb_mount</a> </td><td> <a href = "#Sector">Sector</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 = "#Sweep">Sweep</a> </td><td></td></tr>
+<tr><td> <a href = "#Geared_steppers">Geared_steppers</a> </td><td> <a href = "#Sealing_strip">Sealing_strip</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 = "#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 = "#Green_terminals">Green_terminals</a> </td><td> <a href = "#Sheets">Sheets</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 = "#Hygrometer">Hygrometer</a> </td><td> <a href = "#Spades">Spades</a> </td><td> <a href = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Hot_ends">Hot_ends</a> </td><td> <a href = "#Spades">Spades</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 = "#Iecs">Iecs</a> </td><td> <a href = "#Spools">Spools</a> </td><td> <a href = "#Ssr_shroud">Ssr_shroud</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Hygrometer">Hygrometer</a> </td><td> <a href = "#Spools">Spools</a> </td><td> <a href = "#Socket_box">Socket_box</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#Inserts">Inserts</a> </td><td> <a href = "#Springs">Springs</a> </td><td> <a href = "#Strap_handle">Strap_handle</a> </td><td></td><td></td></tr>
+<tr><td> <a href = "#Iecs">Iecs</a> </td><td> <a href = "#Springs">Springs</a> </td><td> <a href = "#Ssr_shroud">Ssr_shroud</a> </td><td></td><td></td></tr>
-<tr><td> <a href = "#Jack">Jack</a> </td><td> <a href = "#Ssrs">Ssrs</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Inserts">Inserts</a> </td><td> <a href = "#Ssrs">Ssrs</a> </td><td> <a href = "#Strap_handle">Strap_handle</a> </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>
+<tr><td> <a href = "#Jack">Jack</a> </td><td> <a href = "#Stepper_motors">Stepper_motors</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Leadnuts">Leadnuts</a> </td><td> <a href = "#Toggles">Toggles</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Ldrs">Ldrs</a> </td><td> <a href = "#Toggles">Toggles</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Leds">Leds</a> </td><td> <a href = "#Transformers">Transformers</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Leadnuts">Leadnuts</a> </td><td> <a href = "#Transformers">Transformers</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Light_strips">Light_strips</a> </td><td> <a href = "#Tubings">Tubings</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Leds">Leds</a> </td><td> <a href = "#Tubings">Tubings</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Linear_bearings">Linear_bearings</a> </td><td> <a href = "#Variacs">Variacs</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Light_strips">Light_strips</a> </td><td> <a href = "#Variacs">Variacs</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Mains_sockets">Mains_sockets</a> </td><td> <a href = "#Veroboard">Veroboard</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Linear_bearings">Linear_bearings</a> </td><td> <a href = "#Veroboard">Veroboard</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Meter">Meter</a> </td><td> <a href = "#Washers">Washers</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Mains_sockets">Mains_sockets</a> </td><td> <a href = "#Washers">Washers</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Microswitches">Microswitches</a> </td><td> <a href = "#Wire">Wire</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Meter">Meter</a> </td><td> <a href = "#Wire">Wire</a> </td><td></td><td></td><td></td></tr>
-<tr><td> <a href = "#Microview">Microview</a> </td><td> <a href = "#Zipties">Zipties</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Microswitches">Microswitches</a> </td><td> <a href = "#Zipties">Zipties</a> </td><td></td><td></td><td></td></tr>
+<tr><td> <a href = "#Microview">Microview</a> </td><td></td><td></td><td></td><td></td></tr>
 <tr><td> <a href = "#Modules">Modules</a> </td><td></td><td></td><td></td><td></td></tr>
 </table>
 
@@ -195,7 +196,7 @@ Individual teeth are not drawn, instead they are represented by a lighter colour
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```belt(type, points, gap = 0, gap_pt = undef)``` | Draw a belt path given a set of points and pitch radii where the pulleys are. Closed loop unless a gap is specified |
+| ```belt(type, points, gap = 0, gap_pt = undef, belt_colour = grey20, tooth_colour = grey50)``` | Draw a belt path given a set of points and pitch radii where the pulleys are. Closed loop unless a gap is specified |
 
 ![belts](tests/png/belts.png)
 
@@ -260,7 +261,7 @@ Models of radial blowers.
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
 |   1 | ```blower(PE4020)``` |  Blower Pengda Technology 4020 |
-|   1 | ```blower(RM5015)``` |  Blower Runda RB5015 |
+|   1 | ```blower(RB5015)``` |  Blower Runda RB5015 |
 |   3 | ```screw(M3_cap_screw, 20)``` |  Screw M3 cap x 20mm |
 |   2 | ```screw(M4_cap_screw, 25)``` |  Screw M4 cap x 25mm |
 |   3 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
@@ -581,9 +582,58 @@ LCD dispays.
 | ---:|:--- |:---|
 |   1 | ```display(HDMI5)``` |  HDMI display 5" |
 |   1 | ```display(LCD1602A)``` |  LCD display 1602A |
+|   1 | ```display(LCDS7282B)``` |  LCD display S-7282B |
 |   1 | ```display(SSD1963_4p3)``` |  LCD display SSD1963 4.3" |
 
 
+<a href="#top">Top</a>
+
+---
+<a name="Extrusions"></a>
+## Extrusions
+Aluminium  extrusion.
+
+
+[vitamins/extrusions.scad](vitamins/extrusions.scad) Object definitions.
+
+[vitamins/extrusion.scad](vitamins/extrusion.scad) Implementation.
+
+[tests/extrusions.scad](tests/extrusions.scad) Code for this example.
+
+### Properties
+| Function | Description |
+|:--- |:--- |
+| ```extrusion_center_hole(type)``` | Diameter of center hole |
+| ```extrusion_center_square(type)``` | Size of center square |
+| ```extrusion_channel_width(type)``` | Channel width |
+| ```extrusion_channel_width_internal(type)``` | Internal channel width |
+| ```extrusion_corner_hole(type)``` | Diameter of corner hole |
+| ```extrusion_fillet(type)``` | Radius of corner fillet |
+| ```extrusion_height(type)``` | Height of extrusion |
+| ```extrusion_spar_thickness(type)``` | Spar thickness |
+| ```extrusion_tab_thickness(type)``` | Tab thickness |
+| ```extrusion_width(type)``` | Width of extrusion |
+
+### Modules
+| Module | Description |
+|:--- |:--- |
+| ```extrusion(type, length, 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 |
+
+
 <a href="#top">Top</a>
 
 ---
@@ -615,16 +665,11 @@ Can draw three styles: solid, open frame and open frame with screw bosses.
 | ```fan_thickness(type)``` | Thickness of the frame |
 | ```fan_width(type)``` | Width of square |
 
-### Functions
-| Function | Description |
-|:--- |:--- |
-| ```fan_screw_length(type, thickness)``` | Screw length required |
-
 ### Modules
 | Module | Description |
 |:--- |:--- |
 | ```fan(type)``` | Draw specified fan, origin in the centre |
-| ```fan_assembly(type, thickness, include_fan = true, screw = false)``` | Fan with its fasteners |
+| ```fan_assembly(type, thickness, include_fan = true, screw = false, full_depth = false)``` | Fan with its fasteners |
 | ```fan_hole_positions(type, z = undef)``` | Position children at the screw hole positions |
 | ```fan_holes(type, poly = false, screws = true, h = 100)``` | Make all the holes for the fan, or just the aperture if ```screws``` is false. Set ```poly``` true for poly_holes. |
 
@@ -634,6 +679,7 @@ Can draw three styles: solid, open frame and open frame with screw bosses.
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
 |   1 | ```fan(fan120x25)``` |  Fan 120mm x 25mm |
+|   1 | ```fan(fan17x8)``` |  Fan 17mm x 8mm |
 |   1 | ```fan(fan25x10)``` |  Fan 25mm x 10mm |
 |   1 | ```fan(fan30x10)``` |  Fan 30mm x 10mm |
 |   1 | ```fan(fan40x11)``` |  Fan 40mm x 11mm |
@@ -643,17 +689,20 @@ Can draw three styles: solid, open frame and open frame with screw bosses.
 |   1 | ```fan(fan70x15)``` |  Fan 70mm x 15mm |
 |   1 | ```fan(fan80x25)``` |  Fan 80mm x 25mm |
 |   1 | ```fan(fan80x38)``` |  Fan 80mm x 38mm |
+|   4 | ```nut(M2_nut, nyloc = true)``` |  Nut M2 x 1.6mm nyloc |
 |   4 | ```nut(M2p5_nut, nyloc = true)``` |  Nut M2.5 x 2.2mm nyloc |
 |   8 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
 |  28 | ```nut(M4_nut, nyloc = true)``` |  Nut M4 x 3.2mm nyloc |
+|   4 | ```screw(M2_cap_screw, 16)``` |  Screw M2 cap x 16mm |
 |   4 | ```screw(M2p5_pan_screw, 20)``` |  Screw M2.5 pan x 20mm |
 |   8 | ```screw(M3_dome_screw, 20)``` |  Screw M3 dome x 20mm |
 |  20 | ```screw(M4_dome_screw, 16)``` |  Screw M4 dome x 16mm |
 |   4 | ```screw(M4_dome_screw, 25)``` |  Screw M4 dome x 25mm |
 |   4 | ```screw(M4_dome_screw, 30)``` |  Screw M4 dome x 30mm |
-|   4 | ```washer(M2p5_washer)``` |  Washer  M2.5 x 5.9mm x 0.5mm |
+|   8 | ```washer(M2_washer)``` |  Washer  M2 x 5mm x 0.3mm |
-|   8 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
+|   8 | ```washer(M2p5_washer)``` |  Washer  M2.5 x 5.9mm x 0.5mm |
-|  28 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
+|  12 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
+|  32 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
 
 
 <a href="#top">Top</a>
@@ -829,7 +878,7 @@ Needs updating as mostly obsolete versions.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```hot_end(type, filament, naked = false)``` | Draw specified hot end |
+| ```hot_end(type, filament, naked = false, resistor_wire_rotate = [0,0,0])``` | Draw specified hot end |
 
 ![hot_ends](tests/png/hot_ends.png)
 
@@ -943,10 +992,11 @@ IEC mains inlets and outlet.
 |   1 | ```iec(IEC_inlet)``` |  IEC inlet |
 |   1 | ```iec(IEC_inlet_atx)``` |  IEC inlet for ATX |
 |   1 | ```iec(IEC_outlet)``` |  IEC outlet RS 811-7193 |
-|  10 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
+|   1 | ```iec(IEC_switched_fused_inlet)``` |  IEC320 C14 switched fused inlet module |
+|  12 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
 |   4 | ```screw(M3_cs_cap_screw, 10)``` |  Screw M3 cs cap x 10mm |
-|   6 | ```screw(M3_cs_cap_screw, 12)``` |  Screw M3 cs cap x 12mm |
+|   8 | ```screw(M3_cs_cap_screw, 12)``` |  Screw M3 cs cap x 12mm |
-|  10 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
+|  12 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
 
 
 <a href="#top">Top</a>
@@ -1103,7 +1153,9 @@ Nuts for leadscrews.
 | ```leadnut_hole_dia(type)``` | The diameter of the screw holes |
 | ```leadnut_hole_pitch(type)``` | The radia pitch of the screw holes |
 | ```leadnut_holes(type)``` | The number of screw holes |
+| ```leadnut_lead(type)``` | Screw lead |
 | ```leadnut_od(type)``` | Outer diameter of the shank |
+| ```leadnut_pitch(type)``` | Screw pitch |
 | ```leadnut_screw(type)``` | The type of the fixing screws |
 
 ### Functions
@@ -1244,6 +1296,9 @@ LMnUU linear bearings.
 | Function | Description |
 |:--- |:--- |
 | ```bearing_dia(type)``` | Outside diameter |
+| ```bearing_groove_dia(type)``` | Groove diameter |
+| ```bearing_groove_length(type)``` | Groove length |
+| ```bearing_groove_spacing(type)``` | Spacing between grooves, outer to outer, ie includes the grooves themselves |
 | ```bearing_length(type)``` | Total length |
 | ```bearing_rod_dia(type)``` | Internal diameter |
 
@@ -1262,12 +1317,21 @@ LMnUU linear bearings.
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
+|   1 | ```linear_bearing(LM10LUU)``` |  Linear bearing LM10LUU |
 |   1 | ```linear_bearing(LM10UU)``` |  Linear bearing LM10UU |
+|   1 | ```linear_bearing(LM12LUU)``` |  Linear bearing LM12LUU |
 |   1 | ```linear_bearing(LM12UU)``` |  Linear bearing LM12UU |
+|   1 | ```linear_bearing(LM16LUU)``` |  Linear bearing LM16LUU |
+|   1 | ```linear_bearing(LM16UU)``` |  Linear bearing LM16UU |
+|   1 | ```linear_bearing(LM3LUU)``` |  Linear bearing LM3LUU |
 |   1 | ```linear_bearing(LM3UU)``` |  Linear bearing LM3UU |
+|   1 | ```linear_bearing(LM4LUU)``` |  Linear bearing LM4LUU |
 |   1 | ```linear_bearing(LM4UU)``` |  Linear bearing LM4UU |
+|   1 | ```linear_bearing(LM5LUU)``` |  Linear bearing LM5LUU |
 |   1 | ```linear_bearing(LM5UU)``` |  Linear bearing LM5UU |
+|   1 | ```linear_bearing(LM6LUU)``` |  Linear bearing LM6LUU |
 |   1 | ```linear_bearing(LM6UU)``` |  Linear bearing LM6UU |
+|   1 | ```linear_bearing(LM8LUU)``` |  Linear bearing LM8LUU |
 |   1 | ```linear_bearing(LM8UU)``` |  Linear bearing LM8UU |
 
 
@@ -1559,11 +1623,16 @@ If a nut is given a child then it gets placed on its top surface.
 |   1 | ```nut(M2p5_nut)``` |  Nut M2.5 x 2.2mm  |
 |   1 | ```nut(M2p5_nut, nyloc = true)``` |  Nut M2.5 x 2.2mm nyloc |
 |   1 | ```nut(M2p5_nut, nylon = true)``` |  Nut M2.5 x 2.2mm nylon |
+|   1 | ```hammer_nut(M3_hammer_nut)``` |  Nut M3 hammer |
+|   1 | ```sliding_t_nut(M3_sliding_t_nut)``` |  Nut M3 sliding T |
 |   1 | ```nut(M3_nut)``` |  Nut M3 x 2.4mm  |
 |   1 | ```nut(M3_nut, brass = true)``` |  Nut M3 x 2.4mm brass |
 |   1 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
+|   1 | ```hammer_nut(M4_hammer_nut)``` |  Nut M4 hammer |
+|   1 | ```sliding_t_nut(M4_sliding_t_nut)``` |  Nut M4 sliding T |
 |   1 | ```nut(M4_nut)``` |  Nut M4 x 3.2mm  |
 |   1 | ```nut(M4_nut, nyloc = true)``` |  Nut M4 x 3.2mm nyloc |
+|   1 | ```sliding_t_nut(M5_sliding_t_nut)``` |  Nut M5 sliding T |
 |   1 | ```nut(M5_nut)``` |  Nut M5 x 4mm  |
 |   1 | ```nut(M5_nut, nyloc = true)``` |  Nut M5 x 4mm nyloc |
 |   1 | ```nut(M6_half_nut)``` |  Nut M6 x 3mm  |
@@ -1657,6 +1726,13 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 ### 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 |
@@ -1675,16 +1751,20 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 ### 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(cutout = false)``` | Draw HDMI socket |
+| ```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 |
@@ -1694,7 +1774,7 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 | ```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 positions |
+| ```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 |
@@ -1716,14 +1796,15 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 |   1 | ```pcb(DuetE)``` |  Duet 2 Ethernet electronics |
 |   1 | ```pcb(Duex2)``` |  Duex2 expansion board |
 |   1 | ```pcb(Duex5)``` |  Duex5 expasnion board |
+|   1 | ```pcb(EnviroPlus)``` |  Enviro+ |
 |   1 | ```pcb(ExtruderPCB)``` |  Extruder connection PCB |
 |   1 | ```pcb(Keyes5p1)``` |  Keyes5.1 Arduino Uno expansion board |
 |   1 | ```pcb(Melzi)``` |  Melzi electronics |
-|   3 |  |  Micro SD card |
+|   4 |  |  Micro SD card |
 |   1 | ```molex_254(2)``` |  Molex KK header 2 way |
 |   1 | ```molex_254(3)``` |  Molex KK header 3 way |
 |  16 | ```nut(M2_nut, nyloc = true)``` |  Nut M2 x 1.6mm nyloc |
-|  20 | ```nut(M2p5_nut, nyloc = true)``` |  Nut M2.5 x 2.2mm nyloc |
+|  32 | ```nut(M2p5_nut, nyloc = true)``` |  Nut M2.5 x 2.2mm nyloc |
 |  12 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
 |  12 | ```nut(M4_nut, nyloc = true)``` |  Nut M4 x 3.2mm nyloc |
 |   1 | ```pcb(PI_IO)``` |  PI_IO V2 |
@@ -1734,20 +1815,25 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 |   1 | ```pcb(PERF74x51)``` |  Perfboard 74 x 51mm |
 |   1 | ```pcb(PERF80x20)``` |  Perfboard 80 x 20mm |
 |   1 | ```pin_socket(2p54header, 13, 2, right_angle = true)``` |  Pin socket 13 x 2 right_angle |
+|   1 | ```pcb(RAMPSEndstop)``` |  RAMPS Endstop Switch |
 |   1 | ```pcb(RPI3)``` |  Raspberry Pi 3 |
-|   8 | ```screw(M2_cap_screw, 20)``` |  Screw M2 cap x 20mm |
+|   1 | ```pcb(RPI0)``` |  Raspberry Pi Zero |
-|   8 | ```screw(M2_cap_screw, 25)``` |  Screw M2 cap x 25mm |
+|  16 | ```screw(M2_cap_screw, 25)``` |  Screw M2 cap x 25mm |
 |   4 | ```screw(M2p5_cap_screw, 16)``` |  Screw M2.5 cap x 16mm |
-|  12 | ```screw(M2p5_pan_screw, 20)``` |  Screw M2.5 pan x 20mm |
+|   8 | ```screw(M2p5_cap_screw, 20)``` |  Screw M2.5 cap x 20mm |
-|   4 | ```screw(M2p5_pan_screw, 30)``` |  Screw M2.5 pan x 30mm |
+|   4 | ```screw(M2p5_cap_screw, 35)``` |  Screw M2.5 cap x 35mm |
-|   4 | ```screw(M3_cap_screw, 25)``` |  Screw M3 cap x 25mm |
+|   8 | ```screw(M2p5_pan_screw, 20)``` |  Screw M2.5 pan x 20mm |
+|   4 | ```screw(M2p5_pan_screw, 25)``` |  Screw M2.5 pan x 25mm |
+|   4 | ```screw(M2p5_pan_screw, 35)``` |  Screw M2.5 pan x 35mm |
 |   8 | ```screw(M3_cap_screw, 30)``` |  Screw M3 cap x 30mm |
-|  12 | ```screw(M4_cap_screw, 30)``` |  Screw M4 cap x 30mm |
+|   4 | ```screw(M3_cap_screw, 35)``` |  Screw M3 cap x 35mm |
+|   4 | ```screw(M4_cap_screw, 30)``` |  Screw M4 cap x 30mm |
+|   8 | ```screw(M4_cap_screw, 35)``` |  Screw M4 cap x 35mm |
 |   3 | ```terminal_35(2)``` |  Terminal block 2 way 3.5mm |
 |   2 | ```green_terminal(gt_2p54, 4)``` |  Terminal block 4 way 0.1" |
 |   1 |  |  USB A to Mini B lead |
 |  16 | ```washer(M2_washer)``` |  Washer  M2 x 5mm x 0.3mm |
-|  20 | ```washer(M2p5_washer)``` |  Washer  M2.5 x 5.9mm x 0.5mm |
+|  32 | ```washer(M2p5_washer)``` |  Washer  M2.5 x 5.9mm x 0.5mm |
 |  12 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
 |  12 | ```washer(M4_washer)``` |  Washer  M4 x 9mm x 0.8mm |
 |   1 | ```pcb(ZC_A0591)``` |  ZC-A0591 ULN2003 driver PCB |
@@ -1755,21 +1841,24 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 ### Printed
 | Qty | Filename |
 | ---:|:--- |
-|   4 | pcb_spacer20110.stl |
-|   4 | pcb_spacer20120.stl |
 |   4 | pcb_spacer20130.stl |
 |   4 | pcb_spacer20140.stl |
+|   4 | pcb_spacer20150.stl |
+|   4 | pcb_spacer20160.stl |
 |   4 | pcb_spacer25100_2.stl |
-|   4 | pcb_spacer25210.stl |
+|   4 | pcb_spacer25110_2.stl |
+|   4 | pcb_spacer25120_2.stl |
+|   4 | pcb_spacer25230.stl |
+|   4 | pcb_spacer25240.stl |
 |   4 | pcb_spacer2570.stl |
-|   4 | pcb_spacer2580_2.stl |
+|   4 | pcb_spacer2580.stl |
-|   4 | pcb_spacer2590_2.stl |
+|   4 | pcb_spacer2590.stl |
-|   4 | pcb_spacer30150.stl |
+|   4 | pcb_spacer30170.stl |
-|   4 | pcb_spacer30160.stl |
+|   4 | pcb_spacer30180.stl |
-|   4 | pcb_spacer30200.stl |
+|   4 | pcb_spacer30220.stl |
-|   4 | pcb_spacer40170.stl |
-|   4 | pcb_spacer40180.stl |
 |   4 | pcb_spacer40190.stl |
+|   4 | pcb_spacer40200.stl |
+|   4 | pcb_spacer40210.stl |
 
 
 <a href="#top">Top</a>
@@ -1850,18 +1939,20 @@ Pin headers and sockets, etc.
 |:--- |:--- |
 | ```box_header(type, cols = 1, rows = 1, smt = false, cutout = false)``` | Draw box header |
 | ```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, cutout = false)``` | Draw pin header |
+| ```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, cutout = false)``` | Draw pin socket |
+| ```pin_socket(type, cols = 1, rows = 1, right_angle = false, height = 0, smt = false, cutout = false)``` | Draw pin socket |
 
 ![pin_headers](tests/png/pin_headers.png)
 
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   1 | ```box_header(2p54header102)``` |  Box header 10 x 2 |
+|   1 | ```box_header(2p54header, 10, 2)``` |  Box header 10 x 2 |
 |   1 | ```idc_transition(2p54header, 10)``` |  IDC transition header 10 x 2 |
-|   1 | ```pin_header(2p54header102)``` |  Pin header 10 x 2 |
+|   1 | ```pin_header(2p54header, 10, 2)``` |  Pin header 10 x 2 |
+|   1 | ```pin_header(2p54header, 10, 2, right_angle = true)``` |  Pin header 10 x 2 right_angle |
 |   1 | ```pin_socket(2p54header, 10, 2)``` |  Pin socket 10 x 2 |
 |   1 | ```pin_socket(2p54header, 10, 2, right_angle = true)``` |  Pin socket 10 x 2 right_angle |
 
@@ -2057,10 +2148,10 @@ Linear rails with carriages.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```carriage(type, rail)``` | Draw the specified carriage |
+| ```carriage(type, rail, end_color = grey20, wiper_color = grey20)``` | Draw the specified carriage |
 | ```carriage_hole_positions(type)``` | Position children over screw holes |
 | ```rail(type, length)``` | Draw the specified rail |
-| ```rail_assembly(type, length, pos)``` | Rail and carriage assembly |
+| ```rail_assembly(type, length, pos, carriage_end_color = grey20, carriage_wiper_color = grey20)``` | Rail and carriage assembly |
 | ```rail_hole_positions(type, length, first = 0, screws = 100, both_ends = true)``` | Position children over screw holes |
 | ```rail_screws(type, length, thickness, screws = 100)``` | Place screws in the rail |
 
@@ -2107,6 +2198,7 @@ Ring terminals and earth assemblies for DiBond panels.
 ### Properties
 | Function | Description |
 |:--- |:--- |
+| ```ringterm_crimp_length(type)``` | If non-zero the length of the crimp tube |
 | ```ringterm_hole(type)``` | Wire hole diameter |
 | ```ringterm_id(type)``` | Inside diameter |
 | ```ringterm_length(type)``` | Length of the tail including the ring |
@@ -2132,12 +2224,13 @@ Ring terminals and earth assemblies for DiBond panels.
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   2 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
+|   3 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
 |   1 | ```ring_terminal(M3_ringterm)``` |  Ring terminal 3mm |
 |   1 | ```ring_terminal(M3_ringterm_cs)``` |  Ring terminal 3mm |
+|   1 | ```ring_terminal(M3_ringterm_crimp)``` |  Ring terminal crimp 3mm |
 |   1 | ```screw(M3_cap_screw, 10)``` |  Screw M3 cap x 10mm |
-|   1 | ```screw(M3_dome_screw, 10)``` |  Screw M3 dome x 10mm |
+|   2 | ```screw(M3_dome_screw, 10)``` |  Screw M3 dome x 10mm |
-|   4 | ```star_washer(M3_washer)``` |  Washer star M3 x 0.5mm |
+|   6 | ```star_washer(M3_washer)``` |  Washer star M3 x 0.5mm |
 
 
 <a href="#top">Top</a>
@@ -2145,7 +2238,7 @@ Ring terminals and earth assemblies for DiBond panels.
 ---
 <a name="Rockers"></a>
 ## Rockers
-Rocket switch. Also used for neon indicator in the same form factor.
+Rocker switch. Also used for neon indicator in the same form factor.
 
 
 [vitamins/rockers.scad](vitamins/rockers.scad) Object definitions.
@@ -2166,7 +2259,7 @@ Rocket switch. Also used for neon indicator in the same form factor.
 | ```rocker_height(type)``` | Body height |
 | ```rocker_part(type)``` | Part description |
 | ```rocker_pivot(type)``` | Pivot distance from the back of the flange |
-| ```rocker_slot_h(type)``` | Panel slow height |
+| ```rocker_slot_h(type)``` | Panel slot height |
 | ```rocker_slot_w(type)``` | Panel slot width |
 | ```rocker_spades(type)``` | Spade types and positions |
 | ```rocker_width(type)``` | Body width |
@@ -2174,7 +2267,7 @@ Rocket switch. Also used for neon indicator in the same form factor.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```rocker(type)``` | Draw the specified rocker switch |
+| ```rocker(type, colour)``` | Draw the specified rocker switch |
 | ```rocker_hole(type, h = 0)``` | Make a hole to accept a rocker switch, by default 2D, set h for 3D |
 
 ![rockers](tests/png/rockers.png)
@@ -2182,8 +2275,8 @@ Rocket switch. Also used for neon indicator in the same form factor.
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   1 | ```rocker(neon_indicator)``` |  Neon Indicator H8630FBNAL |
+|   2 | ```rocker(neon_indicator)``` |  Neon Indicator H8630FBNAL |
-|   1 | ```rocker(small_rocker)``` |  Rocker Switch PRASA1-16F-BB0BW |
+|   2 | ```rocker(small_rocker)``` |  Rocker Switch PRASA1-16F-BB0BW |
 
 
 <a href="#top">Top</a>
@@ -2201,16 +2294,23 @@ Steel rods and studding with chamfered ends.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```rod(d , l)``` | Draw a smooth rod with specified length and diameter |
+| ```leadscrew(d , l, lead, starts, center = true)``` | Draw a leadscrew with specified diameter, length, lead and number of starts |
-| ```studding(d , l)``` | Draw a threaded rod with specified length and diameter |
+| ```rod(d , l, center = true)``` | Draw a smooth rod with specified diameter and length |
+| ```studding(d , l, center = true)``` | Draw a threaded rod with specified diameter and length |
 
 ![rod](tests/png/rod.png)
 
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
+|   1 | ```leadscrew(10, 80, 8, 4)``` |  Leadscrew 10 x 80mm, 8mm lead, 4 starts |
+|   1 | ```leadscrew(12, 80, 12, 4)``` |  Leadscrew 12 x 80mm, 12mm lead, 4 starts |
+|   1 | ```leadscrew(16, 80, 16, 4)``` |  Leadscrew 16 x 80mm, 16mm lead, 4 starts |
+|   1 | ```leadscrew(6, 80, 2, 1)``` |  Leadscrew 6 x 80mm, 2mm lead, 1 starts |
+|   1 | ```leadscrew(8, 80, 8, 4)``` |  Leadscrew 8 x 80mm, 8mm lead, 4 starts |
 |   1 | ```rod(10, 80)``` |  Smooth rod 10mm x 80mm |
 |   1 | ```rod(12, 80)``` |  Smooth rod 12mm x 80mm |
+|   1 | ```rod(16, 80)``` |  Smooth rod 16mm x 80mm |
 |   1 | ```rod(3, 80)``` |  Smooth rod 3mm x 80mm |
 |   1 | ```rod(4, 80)``` |  Smooth rod 4mm x 80mm |
 |   1 | ```rod(5, 80)``` |  Smooth rod 5mm x 80mm |
@@ -2218,6 +2318,7 @@ Steel rods and studding with chamfered ends.
 |   1 | ```rod(8, 80)``` |  Smooth rod 8mm x 80mm |
 |   1 | ```studding(10, 80)``` |  Threaded rod M10 x 80mm |
 |   1 | ```studding(12, 80)``` |  Threaded rod M12 x 80mm |
+|   1 | ```studding(16, 80)``` |  Threaded rod M16 x 80mm |
 |   1 | ```studding(3, 80)``` |  Threaded rod M3 x 80mm |
 |   1 | ```studding(4, 80)``` |  Threaded rod M4 x 80mm |
 |   1 | ```studding(5, 80)``` |  Threaded rod M5 x 80mm |
@@ -2276,17 +2377,17 @@ Machine screws and wood screws with various head styles.
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
 |   1 | ```screw(No632_pan_screw, 30)``` |  Screw 6-32 pan x 30mm |
-|   1 | ```screw(M2_cap_screw, 25)``` |  Screw M2 cap x 25mm |
+|   1 | ```screw(M2_cap_screw, 10)``` |  Screw M2 cap x 10mm |
-|   1 | ```screw(M2_cs_cap_screw, 25)``` |  Screw M2 cs cap x 25mm |
+|   1 | ```screw(M2_cs_cap_screw, 10)``` |  Screw M2 cs cap x 10mm |
-|   1 | ```screw(M2p5_cap_screw, 25)``` |  Screw M2.5 cap x 25mm |
+|   1 | ```screw(M2p5_cap_screw, 10)``` |  Screw M2.5 cap x 10mm |
-|   1 | ```screw(M2p5_pan_screw, 30)``` |  Screw M2.5 pan x 30mm |
+|   1 | ```screw(M2p5_pan_screw, 10)``` |  Screw M2.5 pan x 10mm |
-|   1 | ```screw(M3_cap_screw, 25)``` |  Screw M3 cap x 25mm |
+|   1 | ```screw(M3_cap_screw, 10)``` |  Screw M3 cap x 10mm |
-|   1 | ```screw(M3_cs_cap_screw, 25)``` |  Screw M3 cs cap x 25mm |
+|   1 | ```screw(M3_cs_cap_screw, 10)``` |  Screw M3 cs cap x 10mm |
-|   1 | ```screw(M3_dome_screw, 25)``` |  Screw M3 dome x 25mm |
+|   1 | ```screw(M3_dome_screw, 10)``` |  Screw M3 dome x 10mm |
 |   1 | ```screw(M3_grub_screw, 6)``` |  Screw M3 grub x 6mm |
-|   1 | ```screw(M3_hex_screw, 30)``` |  Screw M3 hex x 30mm |
+|   1 | ```screw(M3_hex_screw, 10)``` |  Screw M3 hex x 10mm |
-|   1 | ```screw(M3_low_cap_screw, 25)``` |  Screw M3 low cap x 25mm |
+|   1 | ```screw(M3_low_cap_screw, 10)``` |  Screw M3 low cap x 10mm |
-|   1 | ```screw(M3_pan_screw, 30)``` |  Screw M3 pan x 30mm |
+|   1 | ```screw(M3_pan_screw, 10)``` |  Screw M3 pan x 10mm |
 |   1 | ```screw(M4_cap_screw, 25)``` |  Screw M4 cap x 25mm |
 |   1 | ```screw(M4_cs_cap_screw, 25)``` |  Screw M4 cs cap x 25mm |
 |   1 | ```screw(M4_dome_screw, 25)``` |  Screw M4 dome x 25mm |
@@ -2301,8 +2402,8 @@ Machine screws and wood screws with various head styles.
 |   1 | ```screw(M6_pan_screw, 30)``` |  Screw M6 pan x 30mm |
 |   1 | ```screw(M8_cap_screw, 35)``` |  Screw M8 cap x 35mm |
 |   1 | ```screw(M8_hex_screw, 30)``` |  Screw M8 hex x 30mm |
-|   1 | ```screw(No2_screw, 30)``` |  Screw No2 pan wood x 30mm |
+|   1 | ```screw(No2_screw, 10)``` |  Screw No2 pan wood x 10mm |
-|   1 | ```screw(No4_screw, 30)``` |  Screw No4 pan wood x 30mm |
+|   1 | ```screw(No4_screw, 10)``` |  Screw No4 pan wood x 10mm |
 |   1 | ```screw(No6_cs_screw, 30)``` |  Screw No6 cs wood x 30mm |
 |   1 | ```screw(No6_screw, 30)``` |  Screw No6 pan wood x 30mm |
 
@@ -2462,7 +2563,7 @@ Filament spool models
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```spool(type)``` | Draw specified spool |
+| ```spool(type, filament_depth = 0, filament_colour = "white", filament_d = 3)``` | Draw specified spool with optional filament |
 
 ![spools](tests/png/spools.png)
 
@@ -2470,6 +2571,7 @@ Filament spool models
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
 |   1 | ```spool(spool_200x55)``` |  Filament spool 200 x 55 |
+|   1 | ```spool(spool_200x60)``` |  Filament spool 200 x 60 |
 |   1 | ```spool(spool_300x85)``` |  Filament spool 300 x 85 |
 |   1 | ```spool(spool_300x88)``` |  Filament spool 300 x 88 |
 
@@ -2589,7 +2691,7 @@ NEMA stepper motor model.
 | ```NEMA_length(type)``` | Body length |
 | ```NEMA_radius(type)``` | End cap radius |
 | ```NEMA_shaft_dia(type)``` | Shaft diameter |
-| ```NEMA_shaft_length(type)``` | Shaft length above the face |
+| ```NEMA_shaft_length(type)``` | Shaft length above the face, if a list then a leadscrew: length, lead, starts |
 | ```NEMA_width(type)``` | Width of the square face |
 
 ### Functions
@@ -2601,7 +2703,7 @@ NEMA stepper motor model.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```NEMA(type)``` | Draw specified NEMA stepper motor |
+| ```NEMA(type, shaft_angle = 0)``` | Draw specified NEMA stepper motor |
 | ```NEMA_outline(type)``` | 2D outline |
 | ```NEMA_screw_positions(type, n = 4)``` | Positions children at the screw holes |
 | ```NEMA_screws(type, screw, n = 4, screw_length = 8, earth = undef)``` | Place screws and optional earth tag |
@@ -3229,6 +3331,12 @@ Uses [fixing blocks](#fixing_block) and [corner blocks](#corner_block).
 | ```bbox_width(type)``` | Internal width |
 | ```star_washers(type)``` | Set to false to remove star washers. |
 
+### Functions
+| Function | Description |
+|:--- |:--- |
+| ```bbox_area(type)``` | Internal surdface area in m^2 |
+| ```bbox_volume(type)``` | Internal volume in litres |
+
 ### Modules
 | Module | Description |
 |:--- |:--- |
@@ -3238,7 +3346,7 @@ Uses [fixing blocks](#fixing_block) and [corner blocks](#corner_block).
 | ```bbox_base(type)``` | Default base, can be overridden to customise |
 | ```bbox_base_blank(type)``` | 2D template for the base |
 | ```bbox_front(type)``` | Default front, can be overridden to customise |
-| ```bbox_front_blank(type, sheet = false)``` | 2D template for the front |
+| ```bbox_front_blank(type, sheet = false, width = 0)``` | 2D template for the front |
 | ```bbox_left(type)``` | Default left side, can be overridden to customise |
 | ```bbox_left_blank(type, sheet = false)``` | 2D template for the left side |
 | ```bbox_right(type)``` | Default right side, can be overridden to customise |
@@ -3556,6 +3664,7 @@ The ring spacing as well as the number of spokes can be specified, if zero a gas
 | Qty | Filename |
 | ---:|:--- |
 |   1 | fan_guard_120.stl |
+|   1 | fan_guard_17.stl |
 |   1 | fan_guard_25.stl |
 |   1 | fan_guard_30.stl |
 |   1 | fan_guard_40.stl |
@@ -3830,6 +3939,54 @@ Printed handle that can be printed without needing support material due to its t
 |   1 | handle_assembly |
 
 
+<a href="#top">Top</a>
+
+---
+<a name="Pcb_mount"></a>
+## Pcb_mount
+A frame to mount a PCB by its corners when it has no mounting holes.
+The stl must be given a parameterless wrapper in the project that uses it.
+
+
+[printed/pcb_mount.scad](printed/pcb_mount.scad) Implementation.
+
+[tests/pcb_mount.scad](tests/pcb_mount.scad) Code for this example.
+
+### Functions
+| Function | Description |
+|:--- |:--- |
+| ```pcb_mount_length(pcb)``` | Outside length of the mount |
+| ```pcb_mount_width(pcb)``` | Outside width of the mount |
+| ```pillar_x_pitch(pcb)``` | x pitch of screw pillars |
+| ```pillar_y_pitch(pcb)``` | y pitch of screw pillars |
+
+### Modules
+| Module | Description |
+|:--- |:--- |
+| ```pcb_mount(pcb, height = 5, washers = true)``` | Make the STL of a pcb mount for the specified PCB. |
+| ```pcb_mount_assembly(pcb, thickness, height = 5)``` | A PCB mount assembly with fasteners |
+| ```pcb_mount_holes(pcb, h = 0)``` | Drill holes for PCB mount |
+| ```pcb_mount_screw_positions(pcb)``` | Positions of the screws and pillars |
+| ```pcb_mount_washer_stl()``` | A plastic washer to clamp a PCB |
+
+![pcb_mount](tests/png/pcb_mount.png)
+
+### Vitamins
+| Qty | Module call | BOM entry |
+| ---:|:--- |:---|
+|   4 | ```nut(M3_nut, nyloc = true)``` |  Nut M3 x 2.4mm nyloc |
+|   1 | ```pcb(PI_IO)``` |  PI_IO V2 |
+|   1 | ```pin_socket(2p54header, 13, 2)``` |  Pin socket 13 x 2 |
+|   4 | ```screw(M3_cap_screw, 16)``` |  Screw M3 cap x 16mm |
+|   3 | ```terminal_35(2)``` |  Terminal block 2 way 3.5mm |
+|   4 | ```washer(M3_washer)``` |  Washer  M3 x 7mm x 0.5mm |
+
+### Printed
+| Qty | Filename |
+| ---:|:--- |
+|   1 | pcb_mount_PI_IO_5.stl |
+
+
 <a href="#top">Top</a>
 
 ---
@@ -3955,7 +4112,7 @@ Knob with embedded hex head screw.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```screw_knob(screw)``` | Generate the STL foe a knob to fit the specified hex screw |
+| ```screw_knob(screw)``` | Generate the STL for a knob to fit the specified hex screw |
 | ```screw_knob_assembly(screw, length)``` | Assembly with the screw in place |
 
 ![screw_knob](tests/png/screw_knob.png)
@@ -4283,7 +4440,7 @@ Layout objects in a line with equal gaps given a vector of their widths.
 ---
 <a name="Maths"></a>
 ## Maths
-Maths utilities for minapulating vectors and matrices.
+Maths utilities for manipulating vectors and matrices.
 
 
 [utils/maths.scad](utils/maths.scad) Implementation.
@@ -4293,6 +4450,8 @@ Maths utilities for minapulating vectors and matrices.
 ### Functions
 | Function | Description |
 |:--- |:--- |
+| ```angle_between(v1, v2)``` | Return the angle between two vectors |
+| ```euler(R)``` | Convert a rotation matrix to a Euler rotation vector. |
 | ```identity(n, x = 1)``` | Construct an arbitrary size identity matrix |
 | ```reverse(v)``` | Reverse a vector |
 | ```rotate(a, v)``` | Generate a 4x4 rotation matrix, ```a``` can be a vector of three angles or a single angle around ```z```, or around axis ```v``` |
@@ -4303,6 +4462,7 @@ Maths utilities for minapulating vectors and matrices.
 | ```transpose(m)``` | Transpose an arbitrary size matrix |
 | ```unit(v)``` | Convert ```v``` to a unit vector |
 | ```vec3(v)``` | Return a 3 vector with the first three elements of ```v``` |
+| ```vec4(v)``` | Return a 4 vector with the first three elements of ```v``` |
 
 ![maths](tests/png/maths.png)
 
@@ -4469,9 +4629,12 @@ An additional twist around the path can be specified. If the path is closed this
 | ```after(path1, path2)``` | Translate ```path2``` so its start meets the end of ```path1``` and then concatenate |
 | ```arc_points(r, a = [90, 0, 180], al = 90)``` | Generate the points of a circular arc |
 | ```before(path1, path2)``` | Translate ```path1``` so its end meets the start of ```path2``` and then concatenate |
-| ```circle_points(r = 1, z = 0)``` | Generate the points of a circle, setting z makes a single turn spiral |
+| ```cap(facets, segment = 0, end)``` | Create the mesh for an end cap |
+| ```circle_points(r = 1, z = 0, dir = -1)``` | Generate the points of a circle, setting z makes a single turn spiral |
+| ```helical_twist_per_segment(r, pitch, sides)``` | Calculate the twist around Z that rotate_from_to() introduces |
 | ```path_length(path, i = 0, length = 0)``` | Calculated the length along a path |
 | ```rectangle_points(w, h)``` | Generate the points of a rectangle |
+| ```skin_faces(points, npoints, facets, loop, offset = 0)``` | Create the mesh for the swept volume without end caps |
 | ```sweep(path, profile, loop = false, twist = 0)``` | Generate the point list and face list of the swept volume |
 
 ### Modules
@@ -4482,6 +4645,50 @@ An additional twist around the path can be specified. If the path is closed this
 ![sweep](tests/png/sweep.png)
 
 
+<a href="#top">Top</a>
+
+---
+<a name="Thread"></a>
+## Thread
+Utilities for making threads with sweep. They can be used to model screws, nuts, studding, leadscrews, etc, and also to make printed threads.
+
+The ends can be tapered, flat or chamfered by setting the ```top``` and ```bot``` parameters to -1 for tapered, 0 for a flat cut and positive to
+specify a chamfer angle.
+
+Threads are by default solid, so the male version is wrapped around a cylinder and the female inside a tube. This can be suppressed to just get the helix, for
+example to make a printed pot with a screw top lid.
+
+Threads with a typical 60 degree angle appear too bright with OpenSCAD's primitive lighting model as they face towards the lights more than the top and sides of
+a cylinder. To get around this a colour can be passed to thread that is used to colour the cylinder and then toned down to colour the helix.
+
+Making the ends requires a CGAL intersection, which make threads relatively slow. For this reason they are generally disabled when using the GUI but can
+be enabled by setting ```$show_threads``` to ```true```. When the tests are run, by default, threads are enabled only for things that feature them like screws.
+This behaviour can be changed by setting a ```SHOW_THREADS``` environment variable to ```false``` to disable all threads and ```true``` to enable all threads.
+The same variable also affects the generation of assembly diagrams.
+
+Threads obey the $fn, $fa, $fs variables.
+
+
+[utils/thread.scad](utils/thread.scad) Implementation.
+
+[tests/thread.scad](tests/thread.scad) Code for this example.
+
+### Functions
+| Function | Description |
+|:--- |:--- |
+| ```metric_coarse_pitch(d)``` | Convert metric diameter to pitch |
+| ```thread_profile(h, crest, angle, overlap = 0.1)``` | Create thread profile path |
+
+### Modules
+| Module | Description |
+|:--- |:--- |
+| ```female_metric_thread(d, pitch, length, center = true, top = -1, bot = -1, colour = undef)``` | Create female thread with metric profile |
+| ```male_metric_thread(d, pitch, length, center = true, top = -1, bot = -1, solid = true, colour = undef)``` | Create male thread with metric profile |
+| ```thread(dia, pitch, length, profile, center = true, top = -1, bot = -1, starts = 1, solid = true, female = false, colour = undef)``` | Create male or femail thread, ends can be tapered, chamfered or square |
+
+![thread](tests/png/thread.png)
+
+
 <a href="#top">Top</a>
 
 ---

scripts/openscad.py

@@ -24,7 +24,7 @@ from __future__ import print_function
 
 import subprocess, sys
 
-def _run(args, silent):
+def run_list(args, silent = False):
     cmd = ["openscad"] + args
     if not silent:
         for arg in cmd:
@@ -39,7 +39,7 @@ def _run(args, silent):
         sys.exit(rc)
 
 def run(*args):
-    _run(list(args), False)
+    run_list(list(args), False)
 
 def run_silent(*args):
-    _run(list(args), True);
+    run_list(list(args), True);

scripts/options.py

@@ -0,0 +1,49 @@
+#
+# 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/>.
+#
+
+# Set command line options from enviroment variables and check if they have changed
+
+import json, os, deps
+
+def check_options(dir = '.'):
+    global options, options_mtime
+    options = { "show_threads": str(os.getenv("SHOW_THREADS")) }
+    options_fname = dir + '/options.json'
+    try:
+        with open(options_fname) as json_file:
+            last_options = json.load(json_file)
+    except:
+        last_options = {}
+    if last_options != options:
+        with open(options_fname, 'w') as outfile:
+            json.dump(options, outfile, indent = 4)
+    options_mtime = deps.mtime(options_fname)
+
+def have_changed(changed, target):
+    if not changed and deps.mtime(target) < options_mtime:
+        return "command line options changed"
+    return changed
+
+def list():
+    result = []
+    for name in options.keys():
+        value = options[name]
+        if value != 'None':
+            result.append('-D$' + name + '=' + value)
+    return result

scripts/tests.py

@@ -27,6 +27,7 @@ import openscad
 import subprocess
 import bom
 import times
+import options
 import time
 import json
 import shutil
@@ -96,6 +97,7 @@ def tests(tests):
     index = {}
     bodies = {}
     times.read_times()
+    options.check_options(deps_dir)
     #
     # Make cover pic if does not exist as very slow. Delete it to force an update.
     #
@@ -190,11 +192,12 @@ def tests(tests):
             oldest = png_name if mtime(png_name) < mtime(bom_name) else bom_name
             changed = check_deps(oldest, dname)
             changed = times.check_have_time(changed, scad_name)
+            changed = options.have_changed(changed, oldest)
             if changed:
                 print(changed)
                 t = time.time()
                 tmp_name = 'tmp.png'
-                openscad.run("-D", "$bom=2", colour_scheme, "--projection=p", "--imgsize=%d,%d" % (w, h), "--camera=0,0,0,70,0,315,500", "--autocenter", "--viewall", "-d", dname, "-o", tmp_name, scad_name);
+                openscad.run_list(options.list() + ["-D$bom=2", colour_scheme, "--projection=p", "--imgsize=%d,%d" % (w, h), "--camera=0,0,0,70,0,315,500", "--autocenter", "--viewall", "-d", dname, "-o", tmp_name, scad_name]);
                 times.add_time(scad_name, t)
                 do_cmd(["magick", tmp_name, "-trim", "-resize", "1000x600", "-bordercolor", background, "-border", "10", tmp_name])
                 update_image(tmp_name, png_name)

scripts/views.py

@@ -28,6 +28,7 @@ import openscad
 from tests import do_cmd, update_image, colour_scheme, background
 import time
 import times
+import options
 from deps import *
 import os
 import json
@@ -102,6 +103,7 @@ def views(target, do_assemblies = None):
         os.makedirs(deps_dir)
 
     times.read_times(target_dir)
+    options.check_options(deps_dir)
     bounds_fname = top_dir + 'stls/bounds.json'
     with open(bounds_fname) as json_file:
         bounds_map = json.load(json_file)
@@ -154,7 +156,7 @@ def views(target, do_assemblies = None):
                                         f.write("use <%s/%s>\n" % (dir, filename))
                                         f.write("%s();\n" % module);
                                     #
-                                    # Run openscad on th created file
+                                    # Run openscad on the created file
                                     #
                                     dname = deps_name(deps_dir, filename)
                                     for explode in [0, 1]:
@@ -163,11 +165,12 @@ def views(target, do_assemblies = None):
                                             png_name = png_name.replace('_assembly', '_assembled')
                                         changed = check_deps(png_name, dname)
                                         changed = times.check_have_time(changed, png_name)
+                                        changed = options.have_changed(changed, png_name)
                                         tmp_name = 'tmp.png'
                                         if changed:
                                             print(changed)
                                             t = time.time()
-                                            openscad.run("-D$pose=1", "-D$explode=%d" % explode, colour_scheme, "--projection=p", "--imgsize=4096,4096", "--autocenter", "--viewall", "-d", dname, "-o", tmp_name, png_maker_name);
+                                            openscad.run_list(options.list() + ["-D$pose=1", "-D$explode=%d" % explode, colour_scheme, "--projection=p", "--imgsize=4096,4096", "--autocenter", "--viewall", "-d", dname, "-o", tmp_name, png_maker_name]);
                                             times.add_time(png_name, t)
                                             do_cmd(["magick", tmp_name, "-trim", "-resize", "1004x1004", "-bordercolor", background, "-border", "10", tmp_name])
                                             update_image(tmp_name, png_name)

tests/belts.scad

@@ -67,7 +67,7 @@ module belt_test() {
     translate([-25, 0])
         layout([for(b = belts) belt_width(b)], 10)
             rotate([0, 90, 0])
-                belt(belts[$i], [[0, 0, 20], [0, 1, 20]]);
+                belt(belts[$i], [[0, 0, 20], [0, 1, 20]], belt_colour = $i%2==0 ? grey90 : grey20, tooth_colour = $i%2==0 ? grey70 : grey50);
 }
 
 if($preview)

tests/d_connectors.scad

@@ -35,4 +35,5 @@ module d_connectors()
                 }
 
 if($preview)
-    d_connectors();
+    let($show_threads = true)
+        d_connectors();

tests/extrusions.scad

@@ -0,0 +1,30 @@
+//
+// 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 <../utils/layout.scad>
+
+include <../vitamins/extrusions.scad>
+
+module extrusions()
+    layout([for(e = extrusions) extrusion_width(e)], 10)
+        extrusion(extrusions[$i], 80);
+
+if ($preview)
+    extrusions();
+

tests/hygrometer.scad

@@ -0,0 +1,22 @@
+//
+// NopSCADlib Copyright Chris Palmer 2018
+// 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/>.
+//
+use <../vitamins/hygrometer.scad>
+
+if($preview)
+    hygrometer();

tests/inserts.scad

@@ -37,4 +37,5 @@ module inserts() {
 }
 
 if($preview)
-    inserts();
+    let($show_threads = true)
+        inserts();

tests/leadnuts.scad

@@ -27,4 +27,5 @@ module leadnuts()
         leadnut(leadnuts[$i]);
 
 if($preview)
-    leadnuts();
+    let($show_threads = true)
+        leadnuts();

tests/linear_bearings.scad

@@ -22,8 +22,12 @@ use <../utils/layout.scad>
 include <../vitamins/linear_bearings.scad>
 
 module linear_bearings()
-    layout([for(b = linear_bearings) 2 * bearing_radius(b)])
+    layout([for(b = linear_bearings) 2 * bearing_radius(b)]) {
         linear_bearing(linear_bearings[$i]);
 
+        translate([0, 30])
+            linear_bearing(long_linear_bearings[$i]);
+    }
+
 if($preview)
     linear_bearings();

tests/maths.scad

@@ -56,7 +56,7 @@ module maths() {
     //
     z = [0, 0, 1];
     v = cross(u, z);
-    a = acos(u * z);
+    a = angle_between(u, z);
 
 
     l = 20;
@@ -64,6 +64,11 @@ module maths() {
         translate_z(l)
             vflip()
                 arrow(l);
+
+    //
+    // Test Euler
+    //
+    assert(euler(rotate(r)) == r, "euler() failed");
 }
 
 rotate(45)

tests/nuts.scad

@@ -22,13 +22,12 @@ use <../utils/layout.scad>
 include <../vitamins/screws.scad>
 
 module nuts() {
-    for(nyloc = [false, true])
+    layout([for(n = nuts) 2 * nut_radius(n)], 5) let(n = nuts[$i]) {
-        translate([0, nyloc ? 20 : 0])
+        for(nyloc = [false, true])
-            layout([for(n = nuts) 2 * nut_radius(n)], 5)
+            translate([0, nyloc ? 20 : 0])
-                nut(nuts[$i], nyloc);
+                nut(n, nyloc);
 
-    translate([0, 40])
+        translate([0, 40]) {
-        layout([for(n = nuts) 2 * nut_radius(n)], 5) let(n = nuts[$i]) {
             if(n == M3_nut)
                 nut(n, brass = true);
 
@@ -45,7 +44,28 @@ module nuts() {
             if(n == M8_nut)
                 #nut_trap(M8_cap_screw, n, h = 30);
         }
+
+        translate([0, 60]) {
+            if(n == M3_nut)
+                sliding_t_nut(M3_sliding_t_nut);
+
+            if(n == M4_nut)
+                sliding_t_nut(M4_sliding_t_nut);
+
+            if(n == M5_nut)
+                sliding_t_nut(M5_sliding_t_nut);
+        }
+
+        translate([0, 80]) {
+            if(n == M3_nut)
+                hammer_nut(M3_hammer_nut);
+
+            if(n == M4_nut)
+                hammer_nut(M4_hammer_nut);
+       }
+    }
 }
 
 if($preview)
-    nuts();
+    let($show_threads = true)
+        nuts();

tests/opengrab.scad

@@ -29,4 +29,5 @@ module opengrab_test() {
 }
 
 if($preview)
-    opengrab_test();
+    let($show_threads = true)
+        opengrab_test();

tests/pcb_mount.scad

@@ -0,0 +1,35 @@
+//
+// NopSCADlib Copyright Chris Palmer 2019
+// 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 <../printed/pcb_mount.scad>
+
+PI_IO = ["PI_IO", "PI_IO V2",       35.56, 25.4, 1.6, 0,    0,   0, "green", true, [],
+    [[(3.015 - 2.7) * 25.4 - 3.5 /2, (4.5 - 3.685) * 25.4, 90, "term35", 2],
+     [(3.46  - 2.7) * 25.4 - 3.5 /2, (4.5 - 3.69)  * 25.4, 90, "term35", 2],
+     [(3.91  - 2.7) * 25.4 - 3.5 /2, (4.5 - 3.69)  * 25.4, 90, "term35", 2],
+     [(3.4   - 2.7) * 25.4,          (4.5 - 4.15)  * 25.4,  0, "2p54socket", 13, 2],
+    ], []];
+
+module pcb_mounts()
+    if($preview)
+        pcb_mount_assembly(PI_IO, 3);
+    else
+        pcb_mount(PI_IO);
+
+pcb_mounts();

tests/pillars.scad

@@ -26,4 +26,5 @@ module pillars()
         pillar(pillars[$i]);
 
 if($preview)
-    pillars();
+    let($show_threads = true)
+        pillars();

tests/pin_headers.scad

@@ -28,15 +28,18 @@ module pin_headers()
         idc_transition(pin_headers[$i], 10);
 
         translate([0, 20])
-            pin_header(pin_headers[$i], 10, 2);
+            pin_header(pin_headers[$i], 10, 2, right_angle = true);
 
         translate([0, 40])
+            pin_header(pin_headers[$i], 10, 2);
+
+        translate([0, 60])
             box_header(pin_headers[$i], 10, 2);
 
-        translate([0, 65])
+        translate([0, 80])
             pin_socket(pin_headers[$i], 10, 2);
 
-        translate([0, 95])
+        translate([0, 110])
             pin_socket(pin_headers[$i], 10, 2, right_angle = true);
 
     }

tests/rails.scad

@@ -34,7 +34,7 @@ module rails()
             nut = screw_nut(screw);
             washer = screw_washer(screw);
 
-            rail_assembly(rail, length, rail_travel(rail, length) / 2);
+            rail_assembly(rail, length, rail_travel(rail, length) / 2, $i<2 ? grey20 : "green", $i<2 ? grey20 : "red");
 
             rail_screws(rail, length, sheet + nut_thickness(nut, true) + washer_thickness(washer));
 

tests/ring_terminals.scad

@@ -24,7 +24,7 @@ include <../vitamins/ring_terminals.scad>
 
 module ring_terminals()
     layout([for(t = ring_terminals) ringterm_od(t)], 5)
-        rotate(90)
+        rotate(180)
             ring_terminal_assembly(ring_terminals[$i], 3);
 
 if($preview)

tests/rockers.scad

@@ -21,9 +21,13 @@ use <../utils/layout.scad>
 
 include <../vitamins/rockers.scad>
 
-module rockers()
+module rockers() {
-    layout([for(r = rockers) rocker_flange_w(r)], 5)
+    layout([for(r = rockers) rocker_flange_w(r)], 5) {
         rocker(rockers[$i]);
+        translate([0, 25])
+            rocker(rockers[$i], $i==0 ? "red" : "green");
+    }
+}
 
 if($preview)
     rockers();

tests/rod.scad

@@ -24,13 +24,23 @@ include <../vitamins/linear_bearings.scad>
 use <../vitamins/rod.scad>
 
 module rods()
-    layout([for(b = linear_bearings) 2 * bearing_radius(b)]) {
+    layout([for(b = linear_bearings) 2 * bearing_radius(b)]) let(d = bearing_rod_dia(linear_bearings[$i])){
 
-        rod(bearing_rod_dia(linear_bearings[$i]), 80);
+        rod(d, 80);
 
-        translate([0, 20])
+        translate([0, 30])
-            studding(bearing_rod_dia(linear_bearings[$i]), 80);
+            studding(d, 80);
+
+        if(d >= 6)
+            translate([0, 60]) {
+                starts = d > 6 ? 4 : 1;
+                pitch = d > 14 ? 4
+                               : d > 10 ? 3 : 2;
+                let($show_threads = true)
+                    leadscrew(d, 80, starts * pitch, starts);
+            }
     }
 
 if($preview)
-    rods();
+    let($show_threads = true)
+        rods();

tests/screws.scad

@@ -25,13 +25,15 @@ for(y = [0 : len(screw_lists) -1])
     for(x = [0 : len(screw_lists[y]) -1]) {
         screw = screw_lists[y][x];
         if(screw) {
-             length = screw_max_thread(screw)
+             length = screw_head_type(screw) == hs_grub ? 6
-                    ? screw_longer_than(screw_max_thread(screw) + 5)
+                    : screw_radius(screw) <= 1.5 ? 10
-                    : screw_head_type(screw) == hs_grub ? 6 : 30;
+                    : screw_max_thread(screw) ? screw_longer_than(screw_max_thread(screw) + 5)
+                    : 30;
             translate([x * 20, y * 20])
                 screw(screw, length);
         }
     }
 
 if($preview)
-    screws();
+    let($show_threads = true)
+        screws();

tests/spools.scad

@@ -23,9 +23,9 @@ use <../utils/layout.scad>
 include <../vitamins/spools.scad>
 
 module spools()
-    layout([for(s = spools) spool_height(s)], 100)
+    layout([for(s = spools) spool_height(s)], 100) let(s = spools[$i])
         rotate([90, 0, 90])
-            spool(spools[$i]);
+            spool(s, filament_depth =  spool_depth(s) / 2, filament_colour = [pp1_colour, pp2_colour, pp3_colour, pp4_colour][$i % 4], filament_d = $i ? 3 : 1.75);
 
 if($preview)
     spools();

tests/sweep.scad

@@ -44,7 +44,7 @@ knot = [ for(i=[0:.2:359])
            (19*cos(3*i) + 40)*sin(2*i),
             19*sin(3*i) ] ];
 
-sweep(knot, L_points, loop = true, twist = 0);
+sweep(knot, L_points, loop = true);
 
 p = transform_points([[0,0,0], [20,0,5], [10,30,4], [0,0,0], [0,0,20]], scale(10));
 n = 100;

tests/thread.scad

@@ -0,0 +1,52 @@
+//
+// 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 <../utils/thread.scad>
+
+pitch = 2;
+starts = 4;
+
+profile = thread_profile(pitch / 2, pitch * 0.366, 30);
+
+module threads()
+    for(female = [false, true]) translate([0, female ? -20 : 0]) {
+    length = female ? 8  : 40;
+    dia = female ? 8 : 8 - pitch;
+    colour = female ? brass : silver;
+
+    thread(dia, starts * pitch, length, profile, starts = starts, top = 45, bot = 45, female = female, colour = colour);
+
+    color(colour)
+        translate([20, 0])
+            thread(dia, starts * pitch, length, profile, starts = starts, top = 0, bot = 0, female = female);
+
+    translate([40, 0])
+        thread(dia, starts * pitch, length, profile, starts = starts, top = -1, bot = -1, female = female, colour = colour);
+
+    color(colour)
+        translate([60, 0])
+            thread(dia, 2 * pitch, length, profile, starts = 2, top = -1, bot = -1, female = female);
+
+    color(colour)
+        translate([80, 0])
+            thread(dia, pitch, length, profile, starts = 1, top = -1, bot = -1, female = female);
+}
+
+let($show_threads = true)
+    threads();

tests/toggles.scad

@@ -27,4 +27,5 @@ module toggles()
          toggle(toggles[$i], 3);
 
 if($preview)
-    toggles();
+    let($show_threads = true)
+        toggles();

utils/core/global.scad

@@ -43,7 +43,7 @@ module ellipse(xr, yr) scale([1, yr / xr]) circle4n(xr);
 
 module extrude_if(h, center = true)                 //! Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D
     if(h)
-        linear_extrude(height = h, center = center) // 3D
+        linear_extrude(height = h, center = center, convexity = 2) // 3D
             children();
     else
         children();                                 // 2D

utils/maths.scad

@@ -18,7 +18,7 @@
 //
 
 //
-//! Maths utilities for minapulating vectors and matrices.
+//! Maths utilities for manipulating vectors and matrices.
 //
 function sqr(x) = x * x;
 
@@ -39,9 +39,9 @@ function rotate(a, v) = //! Generate a 4x4 rotation matrix, ```a``` can be a vec
                       sy = sin(av[1]),
                       sz = sin(av[2]))
                           [
-                              [ cy * cz, cz * sx * sy - cx * sz, cx * cz * sy + sx * sz, 0],
+                              [ cy * cz, sx * sy * cz - cx * sz, cx * sy * cz + sx * sz, 0],
-                              [ cy * sz, cx * cz + sx * sy * sz,-cz * sx + cx * sy * sz, 0],
+                              [ cy * sz, sx * sy * sz + cx * cz, cx * sy * sz - sx * cz, 0],
-                              [-sy,      cy * sx,                cx * cy,                0],
+                              [-sy,      sx * cy,                cx * cy,                0],
                               [ 0,       0,                      0,                      1]
                           ]
                 : let(s = sin(a),
@@ -65,6 +65,7 @@ function scale(v) = let(s = is_list(v) ? v : [v, v, v]) //!  Generate a 4x4 matr
                         ];
 
 function vec3(v) = [v.x, v.y, v.z]; //! Return a 3 vector with the first three elements of ```v```
+function vec4(v) = [v.x, v.y, v.z, 1]; //! Return a 4 vector with the first three elements of ```v```
 function transform(v, m) = vec3(m * [v.x, v.y, v.z, 1]); //! Apply 4x4 transform to a 3 vector by extending it and cropping it again
 function transform_points(path, m) = [for(p = path) transform(p, m)]; //! Apply transform to a path
 function unit(v) = let(n = norm(v)) n ? v / n : v; //! Convert ```v``` to a unit vector
@@ -74,3 +75,11 @@ function transpose(m) = [ for(j = [0 : len(m[0]) - 1]) [ for(i = [0 : len(m) - 1
 function identity(n, x = 1) = [for(i = [0 : n - 1]) [for(j = [0 : n - 1]) i == j ? x : 0] ]; //! Construct an arbitrary size identity matrix
 
 function reverse(v) = let(n = len(v) - 1) n < 0 ? [] : [for(i = [0 : n]) v[n - i]]; //! Reverse a vector
+
+function angle_between(v1, v2) = acos(v1 * v2 / (norm(v1) * norm(v2))); //! Return the angle between two vectors
+
+// https://www.gregslabaugh.net/publications/euler.pdf
+function euler(R) = let(ay = asin(-R[2][0]), cy = cos(ay)) //! Convert a rotation matrix to a Euler rotation vector.
+    cy ? [ atan2(R[2][1] / cy, R[2][2] / cy), ay, atan2(R[1][0] / cy, R[0][0] / cy) ]
+       : R[2][0] < 0 ? [atan2( R[0][1],  R[0][2]),  180, 0]
+                     : [atan2(-R[0][1], -R[0][2]), -180, 0];

utils/sweep.scad

@@ -62,6 +62,7 @@ function rotate_from_to(a, b) =
 function calculate_twist(A, B) = let(D = transpose3(B) * A) atan2(D[1][0], D[0][0]);
 //
 // Compute a 4x3 matrix to orientate a frame of the sweep given the position and a 3x3 rotation matrix.
+// Note that the rotation matrix is transposed to allow post multiplication.
 //
 function orientate(p, r) =
     let(x = r[0], y = r[1], z = r[2])
@@ -79,12 +80,21 @@ function rot3_z(a) =
         [ [ c, -s,  0],
           [ s,  c,  0],
           [ 0,  0,  1] ];
-
 //
 // Calculate the unit tangent at a vertex given the indices before and after. One of these can be the same as i in the case
-// of the start and end of a non closed path.
+// of the start and end of a non closed path. Note that the edges are converted to unit vectors so that their relative lengths
+// don't affect the direction of the tangent.
 //
-function tangent(path, before, i, after) = unit(unit(path[after] - path[i]) - unit(path[before] - path[i]));
+function tangent(path, before, i, after) = unit(unit(path[i] - path[before]) + unit(path[after] - path[i]));
+//
+// Calculate the twist per segment caused by rotate_from_to() instead of a simple Euler rotation around Z.
+//
+function helical_twist_per_segment(r, pitch, sides) = //! Calculate the twist around Z that rotate_from_to() introduces
+    let(step_angle = 360 / sides,
+        lt = 2 * r * sin(step_angle),               // length of tangent between two facets
+        slope = atan(2 * pitch / sides / lt)        // slope of tangents
+       ) step_angle * sin(slope);                   // angle tangent should rotate around z projected onto axis rotate_from_to() uses
+
 //
 // Generate all the surface points of the swept volume.
 //
@@ -111,24 +121,28 @@ function skin_points(profile, path, loop, twist = 0) =
             each profile4 * orientate(path[i], rotations[i] * rot3_z(za))
     ];
 
-function cap(facets, segment = 0) = [for(i = [0 : facets - 1]) segment ? facets * segment + i : facets - 1 - i];
+function cap(facets, segment = 0, end) = //! Create the mesh for an end cap
+    let(reverse = is_undef(end) ? segment : end)
+        [for(i = [0 : facets - 1]) facets * segment + (reverse ? i : facets - 1 - i)];
 
 function quad(p, a, b, c, d) = norm(p[a] - p[c]) > norm(p[b] - p[d]) ? [[b, c, d], [b, d, a]] : [[a, b, c], [a, c, d]];
 
-function skin_faces(points, segs, facets, loop) = [for(i = [0 : facets - 1], s = [0 : segs - (loop ? 1 : 2)])
+function skin_faces(points, npoints, facets, loop, offset = 0) = //! Create the mesh for the swept volume without end caps
-   each quad(points,
+    [for(i = [0 : facets - 1], s = [0 : npoints - (loop ? 1 : 2)])
-        s * facets + i,
+       let(j = s + offset, k = loop ? (j + 1) % npoints : j + 1)
-        s * facets + (i + 1) % facets,
+       each quad(points,
-       ((s + 1) % segs) * facets + (i + 1) % facets,
+            j * facets + i,
-       ((s + 1) % segs) * facets + i)];
+            j * facets + (i + 1) % facets,
+            k * facets + (i + 1) % facets,
+            k * facets + i)];
 
 function sweep(path, profile, loop = false, twist = 0) = //! Generate the point list and face list of the swept volume
     let(
-        segments = len(path),
+        npoints = len(path),
         facets = len(profile),
         points = skin_points(profile, path, loop, twist),
-        skin_faces = skin_faces(points, segments, facets, loop),
+        skin_faces = skin_faces(points, npoints, facets, loop),
-        faces = loop ? skin_faces : concat([cap(facets)], skin_faces, [cap(facets, segments - 1)])
+        faces = loop ? skin_faces : concat([cap(facets)], skin_faces, [cap(facets, npoints - 1)])
         ) [points, faces];
 
 module sweep(path, profile, loop = false, twist = 0) { //! Draw a polyhedron that is the swept volume
@@ -141,9 +155,9 @@ function path_length(path, i = 0, length = 0) = //! Calculated the length along
     i >= len(path) - 1 ? length
                        : path_length(path, i + 1, length + norm(path[i + 1] - path[i]));
 
-function circle_points(r = 1, z = 0) = //! Generate the points of a circle, setting z makes a single turn spiral
+function circle_points(r = 1, z = 0, dir = -1) = //! Generate the points of a circle, setting z makes a single turn spiral
     let(sides = r2sides(r))
-        [for(i = [0 : sides - 1]) let(a = i * 360 / sides) [r * sin(a), r * cos(a), z * a / 360]];
+        [for(i = [0 : sides - 1]) let(a = dir * i * 360 / sides) [r * cos(a), r * sin(a), z * i / sides]];
 
 function rectangle_points(w, h) = [[-w/2, -h/2, 0], [-w/2, h/2, 0], [w/2, h/2, 0], [w/2, -h/2, 0]]; //! Generate the points of a rectangle
 

utils/thread.scad

@@ -0,0 +1,217 @@
+//
+// NopSCADlib Copyright Chris Palmer 2019
+// 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/>.
+//
+
+//
+//! Utilities for making threads with sweep. They can be used to model screws, nuts, studding, leadscrews, etc, and also to make printed threads.
+//!
+//! The ends can be tapered, flat or chamfered by setting the ```top``` and ```bot``` parameters to -1 for tapered, 0 for a flat cut and positive to
+//! specify a chamfer angle.
+//!
+//! Threads are by default solid, so the male version is wrapped around a cylinder and the female inside a tube. This can be suppressed to just get the helix, for
+//! example to make a printed pot with a screw top lid.
+//!
+//! Threads with a typical 60 degree angle appear too bright with OpenSCAD's primitive lighting model as they face towards the lights more than the top and sides of
+//! a cylinder. To get around this a colour can be passed to thread that is used to colour the cylinder and then toned down to colour the helix.
+//!
+//! Making the ends requires a CGAL intersection, which make threads relatively slow. For this reason they are generally disabled when using the GUI but can
+//! be enabled by setting ```$show_threads``` to ```true```. When the tests are run, by default, threads are enabled only for things that feature them like screws.
+//! This behaviour can be changed by setting a ```SHOW_THREADS``` environment variable to ```false``` to disable all threads and ```true``` to enable all threads.
+//! The same variable also affects the generation of assembly diagrams.
+//!
+//! Threads obey the $fn, $fa, $fs variables.
+//
+include <../core.scad>
+use <sweep.scad>
+use <maths.scad>
+use <tube.scad>
+
+thread_colour_factor = 0.8; // 60 degree threads appear too bright due to the angle facing the light sources
+
+function thread_profile(h, crest, angle, overlap = 0.1) = //! Create thread profile path
+    let(base = crest + 2 * (h + overlap) * tan(angle / 2))
+        [[-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 femail thread, ends can be tapered, chamfered or square
+    //
+    // Apply colour if defined
+    //
+    module colour(factor) if(is_undef(colour)) children(); else color(colour * factor) children();
+    //
+    // Compress the profile to compensate for it being tilted by the helix angle
+    //
+    scale = cos(atan(pitch / (PI * dia)));
+    sprofile = [for(p = profile) [p.x * scale, p.y, p.z]];
+    //
+    // Extract some properties from the profile, perhaps they should be stored in it.
+    //
+    h = max([for(p = sprofile) p.y]);
+    maxx = max([for(p = sprofile) p.x]);
+    minx = min([for(p = sprofile) p.x]);
+    crest_xmax = max([for(p = sprofile) if(p.x != maxx) p.x]);
+    crest_xmin = min([for(p = sprofile) if(p.x != minx) p.x]);
+    //
+    // If the ends don't taper we need an extra half turn past the ends to be cropped horizontally.
+    //
+    extra_top = top < 0 ? 0 : -minx / pitch;
+    extra_bot = bot < 0 ? 0 :  maxx / pitch;
+    turns = length / pitch + extra_top + extra_bot;
+    //
+    // Generate the helix path, possibly with tapered ends
+    //
+    dir = female ? 1 : -1;
+    r = dia / 2;
+    sides = r2sides4n(r);
+    step_angle = 360 / sides;
+    segs = ceil(turns * sides);
+    leadin = ceil(sides / starts);
+    final = floor(turns * sides) - leadin;
+    path = [for(i = [0 : segs],
+                R = i < leadin && bot < 0 ? r + dir * (h - h * i / leadin)
+                  : i > final  && top < 0 ? r + dir * h * (i - final) / leadin : r,
+                a = i * step_angle - 360 * extra_bot)
+                    [R * cos(a), R * sin(a), a * pitch / 360]];
+    //
+    // Generate the skin vertices
+    //
+    facets = len(profile);
+    twist  = helical_twist_per_segment(r, pitch, sides);
+    //
+    // For female threads we need to invert the profile
+    //
+    iprofile = female ? reverse([for(p = sprofile) [p.x, -p.y, 0]]) : sprofile;
+    //
+    // If the bottom is tapered then the twist will be greater, so pre-twist the profile to get the straight bit at the correct angle
+    //
+    rprofile = bot < 0 ? transform_points(iprofile, rotate(-dir * (helical_twist_per_segment(r - h, pitch, sides) - twist) * sides / PI))
+                       : iprofile;
+    points = skin_points(rprofile, path, false, twist * segs);
+    //
+    // To form the ends correctly we need to use intersection but it is very slow with the full thread so we just
+    // intersect the start and the end and sweep the rest outside of the intersection.
+    //
+    top_chamfer_h = (top > 0 ? h * tan(top) : 0);
+    bot_chamfer_h = (bot > 0 ? h * tan(bot) : 0);
+    top_overlap = max( maxx, top_chamfer_h - crest_xmin) / pitch;
+    bot_overlap = max(-minx, bot_chamfer_h + crest_xmax) / pitch;
+    start =      ceil(sides * (bot_overlap + extra_bot));
+    end = segs - ceil(sides * (top_overlap + extra_top));
+
+    start_skin_faces  = skin_faces(points, start + 1,            facets, false);
+    middle_skin_faces = skin_faces(points, end - start + 1,      facets, false, start);
+    end_skin_faces    = skin_faces(points, segs - end + 1,       facets, false, end);
+
+    start_faces  = concat([cap(facets)              ], start_skin_faces,  [cap(facets, start)]);
+    middle_faces = concat([cap(facets, start, false)], middle_skin_faces, [cap(facets, end)]);
+    end_faces    = concat([cap(facets, end,   false)], end_skin_faces,    [cap(facets, segs)]);
+
+    overlap = - profile[0].y;
+    translate_z((center ? -length / 2 : 0)) {
+        ends_faces = concat(start_faces, end_faces);
+        for(i = [0 : starts - 1])
+            colour(thread_colour_factor)
+                rotate(360 * i / starts + (female ? 180 / starts : 0)) {
+                    render() intersection() {
+                        polyhedron(points, ends_faces);
+
+                        len = length - 2 * eps;
+                        rotate_extrude()
+                            if(female) {
+                                difference() {
+                                    translate([0, eps])
+                                        square([r + h + overlap, len]);
+
+                                    if(top_chamfer_h)
+                                        polygon([[0, length], [r, length], [r - h, length - top_chamfer_h], [0, length - top_chamfer_h]]);
+
+                                    if(bot_chamfer_h)
+                                        polygon([[0, 0], [r, 0], [r - h, bot_chamfer_h], [0, bot_chamfer_h]]);
+                               }
+                            }
+                            else
+                                difference() {
+                                    hull() {
+                                        translate([0, eps])
+                                            square([r, len]);
+
+                                        translate([0, bot_chamfer_h])
+                                            square([r + h + overlap, len - top_chamfer_h - bot_chamfer_h]);
+                                    }
+                                    if(!solid)
+                                        square([r - overlap, length]);
+                                }
+                    }
+
+                    polyhedron(points, middle_faces);
+                }
+
+        if(solid)
+            colour(1)
+                rotate(90)
+                    if(female)
+                        tube(or = r + (top < 0 || bot < 0 ? h : 0) + 2 * overlap, ir = r, h = length, center = false);
+                    else
+                        cylinder(d = dia, h = length);
+    }
+}
+
+module male_metric_thread(d, pitch, length, center = true, top = -1, bot = -1, solid = true, colour = undef) { //! Create male thread with metric profile
+    H = pitch * sqrt(3) / 2;
+    h = 5 * H / 8;
+    minor_d = d - 2 * h;
+    thread(minor_d, pitch, length, thread_profile(h, pitch / 8, 60), center, top, bot, solid = solid, colour = colour);
+}
+
+module female_metric_thread(d, pitch, length, center = true, top = -1, bot = -1, colour = undef) { //! Create female thread with metric profile
+    H = pitch * sqrt(3) / 2;
+    h = 5 * H / 8;
+    thread(d, pitch, length, thread_profile(h, pitch / 4, 60), center, top, bot, solid = false, female = true, colour = colour);
+}
+
+function metric_coarse_pitch(d) //! Convert metric diameter to pitch
+    = d == 1.6 ? 0.35  // M1.6
+               : [0.4, // M2
+                  0.45,// M2.5
+                  0.5, // M3
+                  0.6, // M3.5
+                  0.7, // M4
+                  0,
+                  0.8, // M5
+                  0,
+                  1.0, // M6
+                  0,
+                  0,
+                  0,
+                  1.25, // M8
+                  0,
+                  0,
+                  0,
+                  1.5,  // M10
+                  0,
+                  0,
+                  0,
+                  1.75, // M12
+                  0,
+                  0,
+                  0,
+                  0,    // M14
+                  0,
+                  0,
+                  0,
+                  2.0,  // M16
+                 ][d * 2 - 4];

vitamins/belt.scad

@@ -41,9 +41,7 @@ function no_point(str) = chr([for(c = str) if(c == ".") ord("p") else ord(c)]);
 // We model the belt path at the pitch radius of the pulleys and the pitch line of the belt to get an accurate length.
 // The belt is then drawn by offseting each side from the pitch line.
 //
-module belt(type, points, gap = 0, gap_pt = undef) { //! Draw a belt path given a set of points and pitch radii where the pulleys are. Closed loop unless a gap is specified
+module belt(type, points, gap = 0, gap_pt = undef, belt_colour = grey20, tooth_colour = grey50) { //! Draw a belt path given a set of points and pitch radii where the pulleys are. Closed loop unless a gap is specified
-    belt_colour = grey20;
-    tooth_colour = grey50;
     width = belt_width(type);
     pitch = belt_pitch(type);
     thickness = belt_thickness(type);

vitamins/blowers.scad

@@ -17,7 +17,7 @@
 // If not, see <https://www.gnu.org/licenses/>.
 //
 
-RB5015 = ["RM5015", "Blower Runda RB5015",           51.3, 51, 15, 31.5, M4_cap_screw, 26, [27.3, 25.4], 4.5, [[4.3, 45.4], [47.3,7.4]], 20, 14, 1.5, 1.3, 1.2, 15];
+RB5015 = ["RB5015", "Blower Runda RB5015",           51.3, 51, 15, 31.5, M4_cap_screw, 26, [27.3, 25.4], 4.5, [[4.3, 45.4], [47.3,7.4]], 20, 14, 1.5, 1.3, 1.2, 15];
 PE4020 = ["PE4020", "Blower Pengda Technology 4020", 40,   40, 20, 27.5, M3_cap_screw, 22, [21.5, 20  ], 3.2, [[37,3],[3,37],[37,37]], 29.3, 17, 1.7, 1.2, 1.3, 13];
 
 blowers = [PE4020, RB5015];