Fixed use of intersection with conditional argument to suit new OpenSCAD behaviour.

Fixed bugs right angle pin headers with rows not equal to two.
Added more tests for pin headers.

examples/MainsBreakOutBox/scad/bob_main.scad

@@ -52,7 +52,7 @@ iec = IEC_inlet_atx;
 socket = Contactum;
 
 
-foot = [20, 8, 3, 1, M3_dome_screw, 10];
+foot = Foot(d = 20, h = 8, t = 3, r = 1, screw = M3_dome_screw);
 
 module foot_stl() foot(foot);
 

global_defs.scad

@@ -52,14 +52,7 @@ $fs = extrusion_width / 2;
 
 function round_to_layer(z) = ceil(z / layer_height) * layer_height;
 // Some additional named colours
-grey20                          = [0.2, 0.2, 0.2];
-grey30                          = [0.3, 0.3, 0.3];
-grey40                          = [0.4, 0.4, 0.4];
-grey50                          = [0.5, 0.5, 0.5];
-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];
+function grey(n) = [0.01, 0.01, 0.01] * n;                                          //! Generate a shade of grey to pass to color().
 gold                            = [255/255, 215/255, 0/255];
 brass                           = [255/255, 220/255, 100/255];
 silver                          = [0.75, 0.75, 0.75];

lib.scad

@@ -29,6 +29,7 @@ include <vitamins/batteries.scad>
 include <vitamins/blowers.scad>
 include <vitamins/bulldogs.scad>
 include <vitamins/buttons.scad>
+include <vitamins/cameras.scad>
 include <vitamins/components.scad>
 include <vitamins/displays.scad>
 include <vitamins/extrusions.scad>
@@ -42,8 +43,10 @@ include <vitamins/ldrs.scad>
 include <vitamins/leadnuts.scad>
 include <vitamins/led_meter.scad>
 include <vitamins/light_strips.scad>
+include <vitamins/magnets.scad>
 include <vitamins/mains_sockets.scad>
 include <vitamins/modules.scad>
+include <vitamins/panel_meters.scad>
 include <vitamins/pillars.scad>
 include <vitamins/pin_headers.scad>
 include <vitamins/pulleys.scad>
@@ -82,6 +85,7 @@ use <utils/rounded_cylinder.scad>
 use <utils/dogbones.scad>
 use <utils/tube.scad>
 use <utils/quadrant.scad>
+use <utils/gears.scad>
 use <utils/hanging_hole.scad>
 use <utils/fillet.scad>
 use <utils/rounded_polygon.scad>

libtest.scad

@@ -29,6 +29,7 @@ use <tests/blowers.scad>
 use <tests/bulldogs.scad>
 use <tests/buttons.scad>
 use <tests/cable_strips.scad>
+use <tests/cameras.scad>
 use <tests/circlips.scad>
 use <tests/components.scad>
 use <tests/d_connectors.scad>
@@ -49,11 +50,13 @@ use <tests/LEDs.scad>
 use <tests/light_strips.scad>
 use <tests/linear_bearings.scad>
 use <tests/LED_meters.scad>
+use <tests/magnets.scad>
 use <tests/microswitches.scad>
 use <tests/modules.scad>
 use <tests/nuts.scad>
 use <tests/o_ring.scad>
 use <tests/opengrab.scad>
+use <tests/panel_meters.scad>
 use <tests/PCBs.scad>
 use <tests/pillars.scad>
 use <tests/PSUs.scad>
@@ -71,7 +74,7 @@ use <tests/spades.scad>
 use <tests/springs.scad>
 use <tests/SSRs.scad>
 use <tests/stepper_motors.scad>
-use <tests/swiss_clips.scad>
+use <tests/Swiss_clips.scad>
 use <tests/toggles.scad>
 use <tests/transformers.scad>
 use <tests/tubings.scad>
@@ -114,17 +117,17 @@ cable_grommets_y = 0;
 translate([x5, cable_grommets_y])
     cable_grommets();
 
-translate([x5, cable_grommets_y + 50])
-    feet();
+translate([x5 + 80, cable_grommets_y])
+    ribbon_clamps();
 
-translate([x5, cable_grommets_y + 75])
+translate([x5, cable_grommets_y + 60])
     fixing_blocks();
 
-translate([x5, cable_grommets_y + 100])
+translate([x5, cable_grommets_y + 90])
     corner_blocks();
 
 translate([x5, cable_grommets_y + 150])
-    ribbon_clamps();
+    feet();
 
 translate([x5 + 70, cable_grommets_y + 150])
     screw_knobs();
@@ -269,8 +272,9 @@ translate([x1, leadnuts_y])
 
 leds_y = 0;
 carriers_y = leds_y + 40;
-spades_y = carriers_y + 40;
-buttons_y = spades_y + 40;
+magnets_y = carriers_y + 40;
+spades_y = magnets_y + 20;
+buttons_y = spades_y + 20;
 jacks_y = buttons_y + 40;
 microswitches_y = jacks_y + 40;
 rockers_y = microswitches_y + 40;
@@ -286,6 +290,9 @@ translate([x2 + 35, leds_y])
 translate([x2 + 8, carriers_y])
     carriers();
 
+translate([x2, magnets_y])
+    magnets();
+
 translate([x2 + 20, carriers_y])
     led_meters();
 
@@ -321,7 +328,8 @@ ssrs_y = modules_y + 80;
 blowers_y = ssrs_y + 60;
 batteries_y = blowers_y + 100;
 steppers_y = batteries_y + 70;
-extrusions_y = steppers_y + 100;
+panel_meters_y = steppers_y + 70;
+extrusions_y = panel_meters_y + 80;
 
 translate([x3, veroboard_y])
     veroboard_test();
@@ -332,6 +340,9 @@ translate([x3 + 70, veroboard_y + 30])
 translate([x3 + 140, veroboard_y + 20])
     pcb_mounts();
 
+translate([x3 + 170, veroboard_y + 16])
+    cameras();
+
 translate([x3, d_connectors_y])
     d_connectors();
 
@@ -362,9 +373,11 @@ translate([x3, batteries_y])
 translate([x2, steppers_y])  // interloper
     stepper_motors();
 
-translate([x2, extrusions_y]) {
+translate([x2, panel_meters_y])
+    panel_meters();
+
+translate([x2, extrusions_y])
     extrusions();
-}
 
 translate([x3, transformers_y])
     transformers();
@@ -377,7 +390,7 @@ sk_brackets_y = extrusion_brackets_y + 80;
 kp_pillow_blocks_y = sk_brackets_y + 50;
 scs_bearing_blocks_y = kp_pillow_blocks_y + 60;
 
-translate([x4 + 150, belts_y + 58]) {
+translate([x4 + 200, belts_y + 58]) {
     belt_test();
 
     translate([0, 60])

printed/box.scad

@@ -31,26 +31,29 @@
 //!
 //! Normally the side sheets are the same type but they can be overridden individually as long as the substitute has the same thickness.
 //
-include <../utils/core/core.scad>
+include <../core.scad>
 use <../vitamins/sheet.scad>
-use <../vitamins/screw.scad>
-use <../vitamins/washer.scad>
 use <../vitamins/insert.scad>
 use <../utils/quadrant.scad>
+use <../utils/round.scad>
 
 bezel_clearance = 0.2;
 sheet_end_clearance = 1;
 sheet_slot_clearance = 0.2;
 
-function box_screw(type)     = type[0]; //! Screw type to be used at the corners
-function box_wall(type)      = type[1]; //! Wall thickness of 3D parts
-function box_sheets(type)    = type[2]; //! Sheet type used for the sides
-function box_top_sheet(type) = type[3]; //! Sheet type for the top
-function box_base_sheet(type)= type[4]; //! Sheet type for the bottom
-function box_feet(type)      = type[5]; //! True to enable feet on the bottom bezel
-function box_width(type)     = type[6]; //! Internal width
-function box_depth(type)     = type[7]; //! Internal depth
-function box_height(type)    = type[8]; //! Internal height
+function box_screw(type)       = type[0]; //! Screw type to be used at the corners
+function box_shelf_screw(type) = type[1]; //! Screw type to hold a shelf
+function box_wall(type)        = type[2]; //! Wall thickness of 3D parts
+function box_sheets(type)      = type[3]; //! Sheet type used for the sides
+function box_top_sheet(type)   = type[4]; //! Sheet type for the top
+function box_base_sheet(type)  = type[5]; //! Sheet type for the bottom
+function box_feet(type)        = type[6]; //! True to enable feet on the bottom bezel
+function box_width(type)       = type[7]; //! Internal width
+function box_depth(type)       = type[8]; //! Internal depth
+function box_height(type)      = type[9]; //! Internal height
+
+function box(screw, wall, sheets, top_sheet, base_sheet, size, feet = false, shelf_screw = M3_dome_screw) = //! Construct a property list for a box.
+ concat([screw, shelf_screw, wall, sheets, top_sheet, base_sheet, feet], size);
 
 function box_bezel_clearance(type) = bezel_clearance;
 
@@ -59,6 +62,7 @@ function box_profile_overlap(type) = 3 + sheet_end_clearance / 2;
 
 function box_washer(type) = screw_washer(box_screw(type));
 function box_insert(type) = screw_insert(box_screw(type));
+function box_shelf_insert(type) = screw_insert(box_shelf_screw(type));
 
 function box_hole_inset(type) = washer_radius(box_washer(type)) + 1;
 function box_insert_r(type) = insert_hole_radius(box_insert(type));
@@ -87,23 +91,32 @@ function box_bezel_height(type, bottom) = //! Bezel height for top or bottom
 
 grill_hole = 5;
 grill_gap = 1.9;
-module grill(width, height, r = 1000, poly = false, h = 0) { //! A staggered array of 5mm holes to make grills in sheets. Can be constrained to be circular. Set ```poly``` ```true``` for printing, ```false``` for milling.
+
+function box_grill_hole_r() = grill_hole / 2;
+
+module grill_hole_positions(width, height, r = 1000) {
     nx = floor(width / (grill_hole + grill_gap));
     xpitch = width / nx;
     ny = floor(height / ((grill_hole + grill_gap) * cos(30)));
     ypitch = height / ny;
 
+    for(y = [0 : ny - 1], x = [0 : nx - 1 - (y % 2)]) {
+        $x = -width / 2 + (x + 0.5 + (y % 2) / 2) * xpitch;
+        $y = -height / 2 + (y + 0.5) * ypitch;
+        if(sqrt(sqr($x) + sqr($y)) + grill_hole / 2 <= r)
+            translate([$x, $y])
+                children();
+    }
+}
+
+module grill(width, height, r = 1000, poly = false, h = 0) { //! A staggered array of 5mm holes to make grills in sheets. Can be constrained to be circular. Set ```poly``` ```true``` for printing, ```false``` for milling.
     extrude_if(h)
-        for(y = [0 : ny - 1], x = [0 : nx - 1 - (y % 2)]) {
-            x = -width / 2 + (x + 0.5 + (y % 2) / 2) * xpitch;
-            y = -height / 2 + (y + 0.5) * ypitch;
-            if(sqrt(sqr(x) + sqr(y)) + grill_hole / 2 <= r)
-                translate([x, y])
-                    if(poly)
-                        poly_circle(r = grill_hole / 2);
-                    else
-                        circle(d = grill_hole);
-        }
+        if(poly)
+            grill_hole_positions(width, height, r)
+                poly_circle(r = grill_hole / 2);
+        else
+            grill_hole_positions(width, height, r)
+                circle(d = grill_hole);
 }
 
 module box_corner_profile_2D(type) { //! The 2D shape of the corner profile.
@@ -175,6 +188,15 @@ module box_corner_profile_section(type, section, sections) { //! Generates inter
     }
 }
 
+module box_corner_profile_sections(type, section, sections) { //! Generate four copies of a corner profile section
+    stl("box_corner_profile");
+    offset = box_boss_r(type) + 1;
+    for(i = [0 : 3])
+        rotate(i * 90)
+            translate([offset, offset])
+                box_corner_profile_section(type, section, sections);
+}
+
 module box_corner_quadrants(type, width, depth)
     for(corner = [0:3]) {
         x = [-1,1,1,-1][corner];
@@ -258,10 +280,11 @@ dowel_length = 20;
 dowel_wall = extrusion_width * 3;
 dowel_h_wall = layer_height * 6;
 
-
 module box_bezel_section(type, bottom, rows, cols, x, y) { //! Generates interlocking sections of the bezel to allow it to be bigger than the printer
-    w = (box_width(type) + 2 * box_outset(type)) / cols;
-    h = (box_depth(type) + 2 * box_outset(type)) / rows;
+    tw = box_width(type) + 2 * box_outset(type);
+    w = tw / cols;
+    th = box_depth(type) + 2 * box_outset(type);
+    h = th / rows;
     bw = box_outset(type) - bezel_clearance / 2;
     bw2 = box_outset(type) + box_inset(type);
 
@@ -336,7 +359,7 @@ module box_bezel_section(type, bottom, rows, cols, x, y) { //! Generates interlo
         render() difference() {
             union() {
                 clip(xmin = 0, xmax = w, ymin = 0, ymax = h)
-                    translate([box_width(type) / 2 + box_outset(type) - x * w, box_depth(type) / 2 + box_outset(type) - y * h, box_profile_overlap(type)])
+                    translate([tw / 2 - x * w, th / 2 - y * h, box_profile_overlap(type)])
                         box_bezel(type, bottom);
 
                 if(x < cols - 1 && y == 0)
@@ -396,7 +419,6 @@ module box_bezel_section(type, bottom, rows, cols, x, y) { //! Generates interlo
     }
 }
 
-
 module box_screw_hole_positions(type)
     for(x = [-1, 1], y = [-1, 1])
         translate([x * (box_width(type) / 2 - box_hole_inset(type)), y * (box_depth(type) / 2 - box_hole_inset(type))])
@@ -439,6 +461,96 @@ module box_shelf_blank(type, sheet = false) { //! Generates a 2D template for a
     }
 }
 
+module box_shelf_screw_positions(type, screw_positions, thickness = 0, wall = undef) { //! Place children at the shelf screw positions
+    w = is_undef(wall) ? box_wall(type) : wall;
+    insert = box_shelf_insert(type);
+    translate_z(-insert_boss_radius(insert, w))
+        for(p = screw_positions)
+            multmatrix(p)
+                translate_z(thickness)
+                    children();
+}
+
+module box_shelf_bracket(type, screw_positions, wall = undef) { //! Generates a shelf bracket, the first optional child is a 2D cutout and the second 3D cutouts
+    stl("shelf_bracket");
+    w = is_undef(wall) ? box_wall(type) : wall;
+    insert = box_shelf_insert(type);
+    lip = 2 * insert_boss_radius(insert, w);
+    width = insert_length(insert) + w;
+
+    module shape()
+        difference() {
+            square([box_width(type), box_depth(type)], center = true);
+
+            offset(bezel_clearance / 2)
+                box_corner_quadrants(type, box_width(type), box_depth(type));
+
+            if($children)
+                hflip()
+                    children();
+        }
+
+    module boss()
+        translate_z(-width + eps)
+            linear_extrude(width - 2 * eps)
+                hull() {
+                    circle4n(r = lip / 2 - eps);
+
+                    translate([-lip / 2, -lip / 2 + eps])
+                        square([lip, eps]);
+                }
+
+    difference() {
+        union() {
+            linear_extrude(w)
+                difference() {
+                    shape()
+                        if($children)
+                            children(0);
+
+                    round(2) offset(-width)
+                        shape()
+                            if($children)
+                                children(0);
+                }
+
+            linear_extrude(lip)
+                difference() {
+                    shape()
+                        if($children)
+                            children(0);
+
+                    offset(-w)
+                        shape()
+                            if($children)
+                                children(0);
+                }
+
+            hflip()
+                box_shelf_screw_positions(type, screw_positions, 0, w)
+                    boss();
+        }
+        if($children > 1)
+            hflip()
+                children(1);
+
+        hflip()
+            box_shelf_screw_positions(type, screw_positions, 0, w)
+                insert_hole(insert, counterbore = 1, horizontal = true);
+    }
+}
+
+module box_shelf_bracket_section(type, rows, cols, x, y) { //! Generates sections of the shelf bracket to allow it to be bigger than the printer
+    tw = box_width(type);
+    w = tw / cols;
+    th = box_depth(type);
+    h = th / rows;
+
+    clip(xmin = 0, xmax = w, ymin = 0, ymax = h)
+        translate([tw / 2 - x * w, th / 2 - y * h])
+            children();
+}
+
 module box_left_blank(type, sheet = false) { //! Generates a 2D template for the left sheet, ```sheet``` can be set to override the type
     dxf("box_left");
 

printed/butt_box.scad

@@ -50,6 +50,9 @@ 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(screw, sheets, base_sheet, top_sheet, span, size, name = "bbox", skip_blocks = [], star_washers = true) = //! Construct the property list for a butt_box
+ [ screw, sheets, base_sheet, top_sheet, span, size.x, size.y, size.z, name, skip_blocks, star_washers ];
+
 function bbox_volume(type) = bbox_width(type) * bbox_depth(type) * bbox_height(type) / 1000000; //! Internal volume in litres
 function bbox_area(type) = let(w =  bbox_width(type), d = bbox_depth(type), h = bbox_height(type)) //! Internal surdface area in m^2
     2 * (w * d + w * h + d * h) / 1000000;
@@ -107,12 +110,9 @@ function fixing_block_positions(type) = let(
 
 function side_holes(type) = [for(p = fixing_block_positions(type), q = fixing_block_holes(bbox_screw(type))) p * q];
 
-module drill_holes(type, t)
-    for(list = [corner_holes(type), side_holes(type)], p = list)
-        let(q = t * p)
-            if(abs(transform([0, 0, 0], q).z) < eps)
-                multmatrix(q)
-                    drill(screw_clearance_radius(bbox_screw(type)), 0);
+module bbox_drill_holes(type, t)
+    position_children(concat(corner_holes(type), side_holes(type)), t)
+        drill(screw_clearance_radius(bbox_screw(type)), 0);
 
 module bbox_base_blank(type) { //! 2D template for the base
     dxf(str(bbox_name(type), "_base"));
@@ -120,7 +120,7 @@ module bbox_base_blank(type) { //! 2D template for the base
     difference() {
         sheet_2D(bbox_base_sheet(type), bbox_width(type), bbox_depth(type), 1);
 
-        drill_holes(type, translate(bbox_height(type) / 2));
+        bbox_drill_holes(type, translate(bbox_height(type) / 2));
     }
 }
 
@@ -133,7 +133,7 @@ module bbox_top_blank(type) { //! 2D template for the top
         translate([0, t / 2])
             sheet_2D(bbox_top_sheet(type), bbox_width(type) + 2 * t, bbox_depth(type) + t);
 
-        drill_holes(type, translate(-bbox_height(type) / 2));
+        bbox_drill_holes(type, translate(-bbox_height(type) / 2));
     }
 }
 
@@ -151,7 +151,7 @@ module bbox_left_blank(type, sheet = false) { //! 2D template for the left side
         translate([-t / 2, -bb / 2])
             sheet_2D(subst_sheet(type, sheet), bbox_depth(type) + t, bbox_height(type) + bb);
 
-        drill_holes(type, rotate([0, 90, 90]) * translate([bbox_width(type) / 2, 0]));
+        bbox_drill_holes(type, rotate([0, 90, 90]) * translate([bbox_width(type) / 2, 0]));
     }
 }
 
@@ -165,7 +165,7 @@ module bbox_right_blank(type, sheet = false) { //! 2D template for the right sid
         translate([t / 2, -bb / 2])
             sheet_2D(subst_sheet(type, sheet), bbox_depth(type) + t, bbox_height(type) + bb);
 
-        drill_holes(type, rotate([0, 90, 90]) * translate([-bbox_width(type) / 2, 0]));
+        bbox_drill_holes(type, rotate([0, 90, 90]) * translate([-bbox_width(type) / 2, 0]));
     }
 }
 
@@ -180,7 +180,7 @@ module bbox_front_blank(type, sheet = false, width = 0) { //! 2D template for th
         translate([0, (bt - bb) / 2])
             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]));
+        bbox_drill_holes(type, rotate([-90, 0, 0]) * translate([0, bbox_depth(type) / 2]));
     }
 }
 
@@ -194,7 +194,7 @@ module bbox_back_blank(type, sheet = false) { //! 2D template for the back
         translate([0, -bb / 2])
             sheet_2D(subst_sheet(type, sheet), bbox_width(type), bbox_height(type) + bb);
 
-        drill_holes(type, rotate([-90, 0, 0]) * translate([0, -bbox_depth(type) / 2]));
+        bbox_drill_holes(type, rotate([-90, 0, 0]) * translate([0, -bbox_depth(type) / 2]));
     }
 }
 

printed/door_hinge.scad

@@ -74,7 +74,7 @@ module door_hinge(door_thickness) {                         //! Generates STL fo
                             square([1, thickness + door_thickness]);
                     }
                     translate([dia / 2, thickness + door_thickness / 2])
-                        teardrop(r = screw_clearance_radius(pin_screw), h = 0);
+                        teardrop_plus(r = screw_clearance_radius(pin_screw), h = 0);
                 }
         linear_extrude(thickness)
             difference() {
@@ -127,7 +127,7 @@ module door_hinge_stat_stl() { //! Generates the STL for the stationary part
                             square([dia, 1], center = true);
                     }
                     translate([0, dia / 2 + stat_clearance])
-                        teardrop(r = screw_clearance_radius(pin_screw), h = 0);
+                        teardrop_plus(r = screw_clearance_radius(pin_screw), h = 0);
                }
     }
 }

printed/flat_hinge.scad

@@ -42,6 +42,9 @@ function hinge_screws(type)      = type[8]; //! How many screws
 function hinge_clearance(type)   = type[9]; //! Clearance between knuckles
 function hinge_margin(type)      = type[10]; //! How far to keep the screws from the knuckes
 
+function flat_hinge(name, size, pin_d, knuckle_d, knuckles, screw, screws, clearance, margin) = //! Construct the property list for a flat hinge.
+ [name, size.x, size.y, size.z, pin_d, knuckle_d, knuckles, screw, screws, clearance, margin];
+
 function hinge_radius(type)      = washer_radius(screw_washer(hinge_screw(type))) + 1;
 
 module hinge_screw_positions(type) { //! Place children at the screw positions

printed/foot.scad

@@ -24,8 +24,10 @@
 include <../core.scad>
 use <../vitamins/insert.scad>
 
-foot        = [25, 12, 3, 2, M4_cap_screw, 10];
-insert_foot = [20, 10, 0, 2, M3_cap_screw, 10];
+function Foot(d, h, t, r, screw, slant = 10) = [d, h, t, r, screw, slant]; //! Construct a foot property list
+
+foot        = Foot(25, 12, 3, 2, M4_cap_screw);
+insert_foot = Foot(20, 10, 0, 2, M3_cap_screw);
 
 function insert_foot() = insert_foot; //! Default foot with insert
 

printed/printed_box.scad

@@ -30,6 +30,9 @@ include <../core.scad>
 use <../vitamins/insert.scad>
 use <foot.scad>
 
+function pbox(name, wall, top_t, base_t, radius, size, foot = false, screw = false, ridges = [0, 0]) //! Construct a printed box property list
+    = concat([name, wall, top_t, base_t, foot, screw, radius, ridges], size);
+
 function pbox_name(type)       = type[0]; //! Name to allow more than one box in a project
 function pbox_wall(type)       = type[1]; //! Wall thickness
 function pbox_top(type)        = type[2]; //! Top thickness
@@ -75,7 +78,7 @@ function pbox_screw_inset(type) = //! How far the base screws are inset
         R =  pbox_radius(type)
     ) max(r, R - (R - r) / sqrt(2));
 
-module pbox_screw_positions(type) {
+module pbox_screw_positions(type) { //! Place children at base screw positions
     foot = pbox_foot(type);
     inset = pbox_screw_inset(type);
     for(x = [-1, 1], y = [-1, 1])
@@ -124,6 +127,9 @@ module pbox_inner_shape(type) {
     rounded_square([w, d], rad, center = true);
 }
 
+module pbox_outer_shape(type) //! 2D outer shape of the box
+    offset(pbox_wall(type) / 2) pbox_mid_shape(type);
+
 module pbox_base(type) { //! Generate the STL for the base
     stl(str(pbox_name(type),"_base"));
     t = pbox_base(type);
@@ -158,7 +164,7 @@ module pbox(type) { //! Generate the STL for the main case
     difference() {
         union() {
             linear_extrude(total_height)
-                offset(wall / 2) pbox_mid_shape(type);
+                pbox_outer_shape(type);
 
             if($children > 2)
                 children(2);

printed/ribbon_clamp.scad

@@ -24,69 +24,72 @@ include <../core.scad>
 use <../vitamins/insert.scad>
 use <../vitamins/cable_strip.scad>
 
-wall = 2;
+wall = 1.6;
 min_wall = 2 * extrusion_width;
 screw = M3_cap_screw;
-insert = screw_insert(screw);
-screw_depth = insert_length(insert) + 1;
 
-function ribbon_clamp_hole_pitch(ways) = ribbon_clamp_slot(ways) + 2 * min_wall + 2 * corrected_radius(insert_hole_radius(insert)); //! Hole pitch
-function ribbon_clamp_width() = 2 * (insert_hole_radius(insert) + 2); //! Width
-function ribbon_clamp_length(ways) = ribbon_clamp_hole_pitch(ways) + ribbon_clamp_width(); //! Length given ways
-function ribbon_clamp_height() = screw_depth + 1; //! Height
+function ribbon_clamp_screw_depth(screw = screw) = insert_length(screw_insert(screw)) + 1;
+function ribbon_clamp_hole_pitch(ways, screw = screw) =
+    ribbon_clamp_slot(ways) + 2 * min_wall + 2 * corrected_radius(insert_hole_radius(screw_insert(screw))); //! Hole pitch
 
-module ribbon_clamp_hole_positions(ways, side = undef) //! Place children at hole positions
+function ribbon_clamp_width(screw = screw) = 2 * (insert_hole_radius(screw_insert(screw)) + wall); //! Width
+function ribbon_clamp_length(ways, screw = screw) = ribbon_clamp_hole_pitch(ways, screw) + ribbon_clamp_width(screw); //! Length given ways
+function ribbon_clamp_height(screw = screw) = ribbon_clamp_screw_depth(screw) + 1; //! Height
+
+module ribbon_clamp_hole_positions(ways, screw = screw, side = undef) //! Place children at hole positions
     for(x = is_undef(side) ? [-1, 1] : side)
-        translate([x * ribbon_clamp_hole_pitch(ways) / 2, 0])
+        translate([x * ribbon_clamp_hole_pitch(ways, screw) / 2, 0])
             children();
 
-module ribbon_clamp_holes(ways, h = 20) //! Drill screw holes
-    ribbon_clamp_hole_positions(ways)
+module ribbon_clamp_holes(ways, h = 20, screw = screw) //! Drill screw holes
+    ribbon_clamp_hole_positions(ways, screw)
         drill(screw_clearance_radius(screw), h);
 
-module ribbon_clamp(ways) { //! Generate STL for given number of ways
-    stl(str("ribbon_clamp_", ways));
+module ribbon_clamp(ways, screw = screw) { //! Generate STL for given number of ways
+    screw_d = screw_radius(screw) * 2;
+    stl(str("ribbon_clamp_", ways, screw_d != 3 ? str("_", screw_d) : ""));
 
-    pitch = ribbon_clamp_hole_pitch(ways);
-    d = ribbon_clamp_width();
-    h = ribbon_clamp_height();
-    t = h - ribbon_clamp_slot_depth() - wall;
+    pitch = ribbon_clamp_hole_pitch(ways, screw);
+    d = ribbon_clamp_width(screw);
+    h = ribbon_clamp_height(screw);
+    t = round_to_layer(ribbon_clamp_slot_depth() + wall);
+    insert = screw_insert(screw);
 
     difference() {
         union() {
             hull() {
                 translate_z(h - t / 2)
-                    cube([ribbon_clamp_hole_pitch(ways), d, t], center = true);
+                    cube([ribbon_clamp_hole_pitch(ways, screw), d, t], center = true);
 
                 translate_z(1)
                     cube([pitch, max(wall, d - 2 * (h - t)), 2], center = true);
             }
-            ribbon_clamp_hole_positions(ways, -1)
+            ribbon_clamp_hole_positions(ways, screw, -1)
                 cylinder(d = d, h = h);
 
-            ribbon_clamp_hole_positions(ways,  1)
+            ribbon_clamp_hole_positions(ways, screw, 1)
                 cylinder(d = d, h = h);
-
         }
 
         translate_z(h)
             cube([ribbon_clamp_slot(ways), d + 1, ribbon_clamp_slot_depth() * 2], center = true);
 
-        ribbon_clamp_hole_positions(ways)
+        ribbon_clamp_hole_positions(ways, screw)
             translate_z(h)
                 rotate(22.5)
-                    insert_hole(insert, screw_depth - insert_length(insert));
+                    insert_hole(insert, ribbon_clamp_screw_depth(screw) - insert_length(insert));
     }
 }
 
-module ribbon_clamp_assembly(ways) pose([55, 180, 25])  //! Printed part with inserts in place
-    assembly(str("ribbon_clamp_", ways)) {
-    h = ribbon_clamp_height();
+module ribbon_clamp_assembly(ways, screw) pose([55, 180, 25])  //! Printed part with inserts in place
+    assembly(let(screw_d = screw_radius(screw) * 2)str("ribbon_clamp_", ways, screw_d != 3 ? str("_", screw_d) : "")) {
+    h = ribbon_clamp_height(screw);
+    insert = screw_insert(screw);
 
     stl_colour(pp1_colour) render()
-        translate_z(h) vflip() ribbon_clamp(ways);
+        translate_z(h) vflip() ribbon_clamp(ways, screw);
 
-    ribbon_clamp_hole_positions(ways)
+    ribbon_clamp_hole_positions(ways, screw)
         vflip()
             insert(insert);
 }
@@ -99,20 +102,24 @@ module ribbon_clamp_fastened_assembly(ways, thickness, screw = screw) { //! Clam
     vitamin(str(": Tape self amalgamating silicone ",tape_l," x 25mm"));
 
     washer = screw_washer(screw);
-    screw_length = screw_shorter_than(2 * washer_thickness(washer) + thickness + screw_depth);
+    screw_length = screw_shorter_than(2 * washer_thickness(washer) + thickness + ribbon_clamp_screw_depth(screw));
 
-    ribbon_clamp_assembly(ways);
+    ribbon_clamp_assembly(ways, screw);
 
     color("red") translate_z(tape_thickness / 2)
         cube([tape_l, tape_width, tape_thickness], center = true);
 
-    ribbon_clamp_hole_positions(ways)
+    ribbon_clamp_hole_positions(ways, screw)
         vflip()
            translate_z(thickness)
                 screw_and_washer(screw, screw_length, true);
 }
 
 module ribbon_clamp_20_stl() ribbon_clamp(20);
+module ribbon_clamp_8_2_stl() ribbon_clamp(8, M2_dome_screw);
 
 //! * Place inserts into the holes and press home with a soldering iron with a conical bit heated to 200&deg;C.
 module ribbon_clamp_20_assembly() ribbon_clamp_assembly(20);
+
+//! * Place inserts into the holes and press home with a soldering iron with a conical bit heated to 200&deg;C.
+module ribbon_clamp_8_2_assembly() ribbon_clamp_assembly(8, M2_dome_screw);

printed/ssr_shroud.scad

@@ -135,7 +135,7 @@ module ssr_shroud_fastened_assembly(type, cable_d, thickness, name) //! Assembly
 
             *translate_z(cable_d / 2)
                 rotate([90, 0, 0])
-                    stl_colour(grey20)
+                    stl_colour(grey(20))
                         cylinder(d = cable_d, h = 20, center = true);
         }
 }

printed/strap_handle.scad

@@ -24,8 +24,7 @@
 include <../core.scad>
 use <../vitamins/insert.scad>
 
-strap = [18, 2, M3_pan_screw, 3, 25];
-function strap() = strap;
+strap = strap();
 
 wall = 2;
 clearance = 0.5;
@@ -40,6 +39,10 @@ function strap_screw(type = strap)     = type[2]; //! Screw type
 function strap_panel(type = strap)     = type[3]; //! Panel thickness
 function strap_extension(type = strap) = type[4]; //! How much length of the strap that can pull out
 
+
+function strap(width = 18, thickness = 2, screw = M3_pan_screw, panel_thickness = 3, extension = 25) = //! Construct a property list for a strap
+ [ width, thickness, screw, panel_thickness, extension ];
+
 function strap_insert(type) = screw_insert(strap_screw(type)); //! The insert type
 function strap_key(type) = strap_panel(type) - panel_clearance;
 function strap_height(type) = wall + max(insert_length(strap_insert(type)) - strap_key(type), strap_thickness(type) + clearance); //! Height of the ends

scripts/bom.py

@@ -213,7 +213,7 @@ def parse_bom(file = "openscad.log", name = None):
                         main.assemblies[stack[-1]].add_part(s)
         else:
             if 'ERROR:' in line or 'WARNING:' in line:
-                print(line[:-1])
+                raise Exception(line[:-1])
     return main
 
 def usage():
@@ -221,53 +221,57 @@ def usage():
     sys.exit(1)
 
 def boms(target = None, assembly = None):
-    bom_dir = set_config(target, usage) + "bom"
-    if assembly:
-        bom_dir += "/accessories"
-        if not os.path.isdir(bom_dir):
+    try:
+        bom_dir = set_config(target, usage) + "bom"
+        if assembly:
+            bom_dir += "/accessories"
+            if not os.path.isdir(bom_dir):
+                os.makedirs(bom_dir)
+        else:
+            assembly = "main_assembly"
+            if os.path.isdir(bom_dir):
+                shutil.rmtree(bom_dir)
+                sleep(0.1)
             os.makedirs(bom_dir)
-    else:
-        assembly = "main_assembly"
-        if os.path.isdir(bom_dir):
-            shutil.rmtree(bom_dir)
-            sleep(0.1)
-        os.makedirs(bom_dir)
-    #
-    # Find the scad file that makes the module
-    #
-    scad_file = find_scad_file(assembly)
-    if not scad_file:
-        raise Exception("can't find source for " + assembly)
-    #
-    # make a file to use the module
-    #
-    bom_maker_name = source_dir + "/bom.scad"
-    with open(bom_maker_name, "w") as f:
-        f.write("use <%s>\n" % scad_file)
-        f.write("%s();\n" % assembly);
-    #
-    # Run openscad
-    #
-    openscad.run("-D", "$bom=2", "-D", "$preview=true", "--hardwarnings", "-o", "openscad.echo", "-d", bom_dir + "/bom.deps", bom_maker_name)
-    os.remove(bom_maker_name)
-    print("Generating bom ...", end=" ")
+        #
+        # Find the scad file that makes the module
+        #
+        scad_file = find_scad_file(assembly)
+        if not scad_file:
+            raise Exception("can't find source for " + assembly)
+        #
+        # make a file to use the module
+        #
+        bom_maker_name = source_dir + "/bom.scad"
+        with open(bom_maker_name, "w") as f:
+            f.write("use <%s>\n" % scad_file)
+            f.write("%s();\n" % assembly);
+        #
+        # Run openscad
+        #
+        openscad.run("-D", "$bom=2", "-D", "$preview=true", "--hardwarnings", "-o", "openscad.echo", "-d", bom_dir + "/bom.deps", bom_maker_name)
+        os.remove(bom_maker_name)
+        print("Generating bom ...", end=" ")
 
-    main = parse_bom("openscad.echo", assembly)
+        main = parse_bom("openscad.echo", assembly)
 
-    if assembly == "main_assembly":
-        main.print_bom(True, open(bom_dir + "/bom.txt","wt"))
+        if assembly == "main_assembly":
+            main.print_bom(True, open(bom_dir + "/bom.txt","wt"))
 
-    for ass in main.assemblies:
-        with open(bom_dir + "/" + ass + ".txt", "wt") as f:
-            bom = main.assemblies[ass]
-            print(bom.make_name(ass) + ":", file=f)
-            bom.print_bom(False, f)
+        for ass in main.assemblies:
+            with open(bom_dir + "/" + ass + ".txt", "wt") as f:
+                bom = main.assemblies[ass]
+                print(bom.make_name(ass) + ":", file=f)
+                bom.print_bom(False, f)
 
-    data = [main.assemblies[ass].flat_data() for ass in main.ordered_assemblies]
-    with open(bom_dir + "/bom.json", 'w') as outfile:
-        json.dump(data, outfile, indent = 4)
+        data = [main.assemblies[ass].flat_data() for ass in main.ordered_assemblies]
+        with open(bom_dir + "/bom.json", 'w') as outfile:
+            json.dump(data, outfile, indent = 4)
 
-    print("done")
+        print("done")
+    except Exception as e:
+        print(str(e))
+        sys.exit(1)
 
 if __name__ == '__main__':
     if len(sys.argv) > 3: usage()
@@ -286,8 +290,4 @@ if __name__ == '__main__':
     if assembly:
         if assembly[-9:] != "_assembly": usage()
 
-    try:
-        boms(target, assembly)
-    except Exception as e:
-        print(str(e))
-        sys.exit(1)
+    boms(target, assembly)

scripts/plateup.py

@@ -27,6 +27,7 @@ import c14n_stl
 from set_config import *
 from deps import *
 from shutil import copyfile
+import re
 
 source_dirs = { "stl" : "platters", "dxf" : "panels" }
 target_dirs = { "stl" : "printed",  "dxf" : "routed" }
@@ -38,43 +39,54 @@ def plateup(target, part_type, usage = None):
     top_dir = set_config(target, usage)
     parts_dir = top_dir + part_type + 's'
     target_dir = parts_dir + '/' + target_dirs[part_type]
-    source_dir = top_dir + source_dirs[part_type]
-    deps_dir = source_dir + "/deps"
-    if not os.path.isdir(source_dir):
-        return
-    if not os.path.isdir(target_dir):
-        os.makedirs(target_dir)
-    if not os.path.isdir(deps_dir):
-        os.makedirs(deps_dir)
+    source_dir1 = source_dirs[part_type]
+    source_dir2 = top_dir + source_dirs[part_type]
     #
-    # Decide which files to make
-    #
-    sources = [file for file in os.listdir(source_dir) if file.endswith('.scad')]
-    #
-    # Run OpenSCAD on the source files to make the targets
+    # Loop through source directories
     #
     used = []
-    for src in sources:
-        src_file = source_dir + '/' + src
-        part_file = target_dir + '/' + src[:-4] + part_type
-        dname = deps_name(deps_dir, src)
-        changed = check_deps(part_file, dname)
-        if changed:
-            print(changed)
-            openscad.run("-D$bom=1", "-d", dname, "-o", part_file, src_file)
-            if part_type == 'stl':
-                c14n_stl.canonicalise(part_file)
-            log_name = 'openscad.log'
-        else:
-            log_name = 'openscad.echo'
-            openscad.run_silent("-D$bom=1", "-o", log_name, src_file)
+    all_sources = []
+    for dir in [source_dir1, source_dir2]:
+        if not os.path.isdir(dir):
+            continue
+        if not os.path.isdir(target_dir):
+            os.makedirs(target_dir)
         #
-        # Add the files on the BOM to the used list
+        # Make the deps dir
         #
-        with open(log_name) as file:
-            for line in file.readlines():
-                if line.startswith('ECHO: "~') and line.endswith('.' + part_type + '"\n'):
-                    used.append(line[8:-2])
+        deps_dir = dir + "/deps"
+        if not os.path.isdir(deps_dir):
+            os.makedirs(deps_dir)
+        #
+        # Decide which files to make
+        #
+        sources = [file for file in os.listdir(dir) if file.endswith('.scad')]
+        all_sources += sources
+        #
+        # Run OpenSCAD on the source files to make the targets
+        #
+        for src in sources:
+            src_file = dir + '/' + src
+            part_file = target_dir + '/' + src[:-4] + part_type
+            dname = deps_name(deps_dir, src)
+            changed = check_deps(part_file, dname)
+            if changed:
+                print(changed)
+                openscad.run("-D$bom=1", "-d", dname, "-o", part_file, src_file)
+                if part_type == 'stl':
+                    c14n_stl.canonicalise(part_file)
+                log_name = 'openscad.log'
+            else:
+                log_name = 'openscad.echo'
+                openscad.run_silent("-D$bom=1", "-o", log_name, src_file)
+            #
+            # Add the files on the BOM to the used list
+            #
+            with open(log_name) as file:
+                for line in file.readlines():
+                    match = re.match(r'^ECHO: "~(.*?\.' + part_type + r').*"$', line)
+                    if match:
+                        used.append(match.group(1))
     #
     # Copy file that are not included
     #
@@ -90,7 +102,7 @@ def plateup(target, part_type, usage = None):
     #
     # Remove any cruft
     #
-    targets = [file[:-4] + part_type for file in sources]
+    targets = [file[:-4] + part_type for file in all_sources]
     for file in os.listdir(target_dir):
         if file.endswith('.' + part_type):
             if not file in targets and not file in copied:

scripts/platters.py

@@ -30,7 +30,7 @@ def usage():
     sys.exit(1)
 
 if __name__ == '__main__':
-   if len(sys.argv) > 2: usage()
+    if len(sys.argv) > 2: usage()
 
     if len(sys.argv) > 1:
         target = sys.argv[1]

tests/PCB.scad

@@ -34,7 +34,7 @@ TMC2130 = ["TMC2130", "TMC2130",
     [
         [  10,  1,  0, "-2p54header", 8, 1 ,undef, "blue" ],
         [  10, 13,  0, "-2p54header", 8, 1],
-        [  12,  7,  0, "-chip", 6, 4, 1, grey20 ],
+        [  12,  7,  0, "-chip", 6, 4, 1, grey(20) ],
         // mock up a heat sink
         [  10,  7,  0, "block", 9, 9,  2, TMC2130HeatSinkColor ],
         [  10, 11,  0, "block", 9, 1, 11, TMC2130HeatSinkColor ],
@@ -58,14 +58,18 @@ test_pcb = ["TestPCB", "Test PCB",
     // components
     [
         [ 20, -5, 180, "trimpot10"],
-        [ 20, -15,  0, "trimpot10", true],
-        [ 10,  2,   0, "smd_led", LED0805, "red"],
+        [ 20, -15,  90, "trimpot10", true],
+        [ 10,  2,   90, "smd_led", LED0805, "red"],
+        [ 13,  2,   90, "smd_led", LED0603, "orange"],
+        [ 16,  2,   90, "smd_res", RES1206, "1K"],
+        [ 19,  2,   90, "smd_res", RES0805, "1K"],
+        [ 22,  2,   90, "smd_res", RES0603, "1K"],
         [ 10,  10,   0, "2p54header", 4, 1],
-        [ 25,  10,   0, "2p54header", 5, 1, undef, "blue" ],
+        [ 25,  10,   0, "2p54header", 5, 1, false, "blue" ],
         [ 10,  20,   0, "2p54boxhdr", 4, 2],
         [ 10,  30,   0, "2p54socket", 6, 1],
-        [ 25,  30,   0, "2p54socket", 4, 1, undef, undef, undef, "red" ],
-        [ 10,  40,   0, "chip", 10, 5, 1, grey20],
+        [ 25,  30,   0, "2p54socket", 4, 1, false, 0, false, "red" ],
+        [ 10,  40,   0, "chip", 10, 5, 1, grey(20)],
         [  5,  50,   0, "led", LED3mm, "red"],
         [ 12,  50,   0, "led", LED5mm, "orange"],
         [ 25,  50,   0, "led", LED10mm, "yellow"],
@@ -82,22 +86,26 @@ test_pcb = ["TestPCB", "Test PCB",
         [  5, 218, 180, "hdmi"],
         [  3, 235, 180, "mini_hdmi"],
         [  6, 175, 180, "uSD", [12, 11.5, 1.4]],
+
+        [ 65,   9,   0, "link", inch(0.4)],
         [ 65,  12,   0, "ax_res", res1_8, 1000],
         [ 65,  17,   0, "ax_res", res1_4, 10000],
         [ 65,  22,   0, "ax_res", res1_2, 100000],
 
+        [ 80,   9,   0, "link", inch(0.2), inch(0.4)],
         [ 80,  12,   0, "ax_res", res1_8, 1000000, 1, inch(0.1)],
         [ 80,  17,   0, "ax_res", res1_4, 100,     2, inch(0.1)],
         [ 80,  22,   0, "ax_res", res1_2, 10,     10, inch(0.2)],
 
         [ 60,   3,   0, "flex"],
-        [ 50,  15,   0, "flat_flex"],
+        [ 50,  15, -90, "flat_flex"],
+        [ 40,  15, -90, "flat_flex", true],
         [ 60,  35,   0, "D_plug", DCONN9],
 
         [ 50,  50,   0, "molex_hdr", 2],
         [ 50,  60,   0, "jst_xh", 2],
         [ 50,  70, 180, "term254", 3],
-        [ 63,  70, 180, "term254", 3, undef, grey20],
+        [ 63,  70, 180, "term254", 3, undef, grey(20)],
         [ 75,  70, 180, "gterm508",2, undef, "blue"],
 
         [ 50,  90, 180, "gterm35", 4, [1,2]],
@@ -107,19 +115,20 @@ test_pcb = ["TestPCB", "Test PCB",
 
         [ 55, 110, 180, "gterm635", 2],
         [ 75, 110, 180, "gterm635", 2, undef, "blue"],
-        [ 90, 110, 180, "gterm", gt_5x17, 2, undef, grey20],
+        [ 90, 110, 180, "gterm", gt_5x17, 2, undef, grey(20)],
 
         [ 50, 130, 180, "term35", 4],
         [ 70, 130, 180, "term35", 3, "lime"],
         [ 50, 150,   0, "transition", 5],
         [ 50, 160,   0, "block", 10, 5, 8, "orange"],
-        [ 50, 170,   0, "button_6mm"],
+        [ 45, 170,   0, "button_6mm"],
+        [ 55, 170,   0, "button_4p5mm"],
         [ 50, 185,   0, "microswitch", small_microswitch],
         [ 52, 200,   0, "pcb", 11, TMC2130 ],
         [ 80, 200,   0, "pdip", 24, "27C32", true, inch(0.6) ],
         [ 80, 170,   0, "pdip", 8, "NE555" ],
         [ 52, 206,   0, "2p54socket", 8, 1 ],
-        [ 52, 194,   0, "2p54socket", 8, 1, undef, undef, undef, "red" ],
+        [ 52, 194,   0, "2p54socket", 8, 1, false, 0, false, "red" ],
         [ 50, 220,   0, "standoff",  5, 4.5, 12.5, 2.54],
         [ 50, 240,   0, "potentiometer"],
         [ 75, 240,   0, "potentiometer", 7, 8],

tests/SMDs.scad

@@ -21,9 +21,14 @@ use <../utils/layout.scad>
 
 include <../vitamins/smds.scad>
 
-module smds()
-    layout([for(l = smd_leds) smd_led_size(l).x], 1)
-        smd_led(smd_leds[$i], ["green", "blue", "red"][$i % 3]);
+module smds() {
+    layout([for(r = smd_resistors) smd_res_size(r).x], 1)
+        smd_resistor(smd_resistors[$i], ["1R0", "10M", "100K"][$i % 3]);
+
+    translate([0, 3])
+        layout([for(l = smd_leds) smd_led_size(l).x], 1)
+            smd_led(smd_leds[$i], ["green", "blue", "red"][$i % 3]);
+}
 
 if($preview)
     smds();

tests/belts.scad

@@ -60,12 +60,12 @@ module belt_test() {
              [p4.x, p4.y, pulley_pr(GT2x20ob_pulley)]
            ];
     belt = GT2x6;
-    belt(belt, path, 80, [0,  belt_pitch_height(belt) - belt_thickness(belt) / 2]);
+    belt(belt, path, 80, [0,  0]);
 
     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_colour = $i%2==0 ? grey90 : grey20, tooth_colour = $i%2==0 ? grey70 : grey50);
+                belt(belts[$i], [[0, 0, 20], [0, 1, 20]], belt_colour = $i%2==0 ? grey(90) : grey(20), tooth_colour = $i%2==0 ? grey(70) : grey(50));
 }
 
 if($preview)

tests/box.scad

@@ -23,7 +23,7 @@ use <../vitamins/insert.scad>
 
 use <../printed/box.scad>
 
-box = [M3_dome_screw, 3, DiBond, PMMA3, DiBond6, true, 150, 100, 70];
+box = box(screw = M3_dome_screw, wall = 3, sheets = DiBond, top_sheet = PMMA3, base_sheet = DiBond6, feet = true, size = [150, 100, 70]);
 
 include <../printed/box_assembly.scad>
 

tests/butt_box.scad

@@ -25,7 +25,7 @@ include <../printed/butt_box.scad>
 
 $explode = 0;
 
-box = [M3_dome_screw, DiBond, DiBond6, PMMA3, 250, 400, 300, 120];
+box = bbox(screw = M3_dome_screw, sheets = DiBond, base_sheet = DiBond6, top_sheet = PMMA3, span = 250, size = [400, 300, 120]);
 
 module bbox_assembly() _bbox_assembly(box);
 

tests/cameras.scad

@@ -0,0 +1,31 @@
+//
+// 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/cameras.scad>
+
+use <../vitamins/pcb.scad>
+
+module cameras()
+    layout([for(c = cameras) pcb_length(camera_pcb(c))], 10, false) let(c = cameras[$i])
+        camera(c);
+
+if($preview)
+    cameras();

tests/catenary.scad

@@ -0,0 +1,56 @@
+//
+// 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/>.
+//
+l = 250; // [1: 1000]
+x = 200; // [1: 1000]
+y = 50; //[-500 : 500]
+
+include <../utils/core/core.scad>
+use <../utils/catenary.scad>
+use <../utils/sweep.scad>
+use <../utils/annotation.scad>
+
+module catenaries() {
+    //
+    // catenary curve path from control points
+    //
+    curve = [for(p = catenary_points(l, x, y)) [p.x, p.y, 0]];
+    //
+    // Draw the curve
+    //
+    r = 0.5;
+    sweep(curve, circle_points(r, $fn = 64));
+    //
+    // Minimum Z
+    //
+    min_z = catenary_points(l, x, y, 0);
+
+    color("blue") {
+        translate([min_z.x, min_z.y + r])
+            rotate([-90, 0, 0])
+                arrow();
+
+        translate([min_z.x, min_z.y - r])
+            rotate([90, 0, 0])
+                arrow();
+    }
+}
+
+if($preview)
+    rotate(is_undef($bom) ? 0 : [70, 0, 315])
+        catenaries();

tests/components.scad

@@ -41,9 +41,12 @@ module components() {
     translate([0, 50])
         TO220("Generic TO220 package");
 
-    translate([50, 50])
+    translate([40, 50])
         panel_USBA();
 
+    translate([80, 50])
+        fack2spm();
+
     translate([0,80])
         thermal_cutouts();
 

tests/flat_hinge.scad

@@ -32,8 +32,8 @@ clearance = 0.2;
 
 angle = 0; // [-90 : 180]
 
-big_hinge =   ["big",   width, depth, thickness, pin_diameter,  knuckle_diameter, knuckles, M3_dome_screw, screws, clearance, margin];
-small_hinge = ["small", 20,    16,    2,         2.85,          7,                3,        M3_dome_screw, 2,      0.2,       0];
+big_hinge =   flat_hinge(name = "big",  size = [width, depth, thickness], pin_d = pin_diameter, knuckle_d = knuckle_diameter, knuckles = knuckles, screw = M3_dome_screw, screws = screws, clearance = clearance, margin = margin);
+small_hinge = flat_hinge(name = "small", size =[ 20,    16,    2],        pin_d = 2.85,         knuckle_d = 7,                knuckles = 3,        screw = M3_dome_screw, screws = 2,      clearance = 0.2,       margin = 0);
 
 hinges = [small_hinge, big_hinge];
 

tests/foot.scad

@@ -21,14 +21,14 @@ use <../printed/foot.scad>
 
 module feet()
     if($preview) {
-        translate([50, 0])
+        translate([40, 0])
             foot_assembly(3);
 
         translate([foot_diameter(insert_foot()) / 2, 0])
             fastened_insert_foot_assembly(3);
     }
     else {
-        translate([50, 0])
+        translate([40, 0])
             foot();
 
         insert_foot();

tests/gears.scad

@@ -0,0 +1,66 @@
+//
+// 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 <../utils/core/core.scad>
+use <../utils/gears.scad>
+
+// left gear teeth
+z1 = 39; // [7 : 1 : 99]
+
+// Right gear teeth
+z2 = 7; // [7 : 1 : 99]
+
+//  Modulus
+m = 2.0; // [0.1 : 0.1 : 5.0]
+
+// Pressure angle
+pa = 20; // [14.5, 20, 22.5, 25]
+
+$show_numbers = false;
+
+module gears() {
+    color(pp1_colour)
+        rotate(-$t * 360)
+            linear_extrude(eps, center = true, convexity = z1)
+                difference() {
+                    involute_gear_profile(m, z1, pa);
+
+                    circle(r = m * z1 / 10);
+                }
+
+    color(pp2_colour)
+        translate([centre_distance(m, z1, z2, pa), 0])
+            rotate(180 + 180 / z2 + $t * 360 * z1 / z2)
+               linear_extrude(eps, center = true, convexity = z2)
+                    difference() {
+                         involute_gear_profile(m, z2, pa);
+
+                         circle(r = m * z2 / 10);
+                    }
+
+    z3 = floor((z1 + z2) / PI);
+    angle = -$t * 360 + 90 - floor(z1 / 4) * 360 / z1; // Line up the rack 1/4 turn around the gear
+    pitch = m * PI;
+    color(pp3_colour)
+        translate([(angle % ((z3 / z1) * 360)) / 360 * z1 * pitch, -centre_distance(m, z1, 0, pa)])
+            linear_extrude(eps, center = true)
+                involute_rack_profile(m, z3, 3 * m, pa);
+}
+
+rotate(is_undef($bom) ? 0 : [70, 0, 315])
+    gears();

tests/horiholes.scad

@@ -0,0 +1,90 @@
+//
+// 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/>.
+//
+$layer_height = 0.25;
+include <../utils/core/core.scad>
+use <../utils/horiholes.scad>
+
+show_disc = true;
+use_horihole = true;
+thickness = 6;
+length = 60;
+height = 20;
+overlap_x = 15;
+overlap_y = 10;
+
+module hole_positions() {
+    x0 = (length - 40) / 2;
+    for($i = [0 : 4], $z = 5 + $i * layer_height / 5, $r = 3)
+        translate([x0 + $i * 10, $z])
+            children();
+
+    for($i = [0 : 4], $z = 15 + $i * layer_height / 5, $r = 0.5 + $i / 2)
+        translate([x0 + $i * 10, $z])
+            children();
+}
+
+module horiholes_stl(t = thickness) {
+    rotate([90, 0, 0])
+        difference() {
+            linear_extrude(t, center = true) {
+                difference() {
+                    square([length, height]);
+
+                    hole_positions()
+                        if(use_horihole)
+                            horihole($r, $z);
+                        else
+                            teardrop_plus(h = 0, r = $r);
+                }
+            }
+        }
+    if(t == thickness)
+        translate([length / 2, 0])
+            rounded_rectangle([length + 2 * overlap_x, thickness + 2 * overlap_y, 2], 5);
+}
+
+module horiholes() {
+    stl_colour(pp1_colour)
+        rotate([-90, 0, 0])
+            horiholes_stl(eps);
+
+    if(show_disc)
+        hole_positions()
+            color(silver)
+                cylinder(r = $r, h = eps, center = true, $fn = 360);
+
+    hole_positions()
+        color("red")
+            linear_extrude(2 * eps, center = true)
+                intersection() {
+                    difference() {
+                        square(8, center = true);
+
+                        horihole($r, $z);
+                    }
+
+                    circle($r, $fn = 360);
+                }
+}
+
+if($preview)
+    rotate(is_undef($bom) ? 0 : [70, 0, 315])
+        horiholes();
+else
+    horiholes_stl();

tests/magnets.scad

@@ -0,0 +1,29 @@
+//
+// NopSCADlib Copyright Chris Palmer 2020
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+include <../core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/magnets.scad>
+
+module magnets()
+    layout([for(m = magnets) magnet_od(m)], 5)
+        magnet(magnets[$i]);
+
+if($preview)
+    magnets();

tests/opengrab.scad

@@ -21,11 +21,11 @@ include <../utils/core/core.scad>
 use <../vitamins/opengrab.scad>
 
 module opengrab_test() {
-    opengrab_target();
-
     rotate(45)
-        translate_z(opengrab_target_thickness())
-            opengrab();
+        opengrab_target();
+
+    translate_z(opengrab_target_thickness())
+        opengrab();
 }
 
 if($preview)

tests/panel_meters.scad

@@ -0,0 +1,29 @@
+//
+// NopSCADlib Copyright Chris Palmer 2020
+// nop.head@gmail.com
+// hydraraptor.blogspot.com
+//
+// This file is part of NopSCADlib.
+//
+// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
+// GNU General Public License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with NopSCADlib.
+// If not, see <https://www.gnu.org/licenses/>.
+//
+include <../core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/panel_meters.scad>
+
+module panel_meters()
+    layout([for(p = panel_meters) pmeter_bezel(p).x], 10)
+        panel_meter(panel_meters[$i]);
+
+if($preview)
+    panel_meters();

tests/pin_headers.scad

@@ -23,26 +23,53 @@ include <../vitamins/pin_headers.scad>
 
 pins = 10;
 
-module pin_headers()
+module pin_headers() {
     layout([for(p = pin_headers) hdr_pitch(p) * pins], 15) {
         idc_transition(pin_headers[$i], 10);
 
         translate([0, 20])
-            pin_header(pin_headers[$i], 10, 2, right_angle = true);
+            pin_header(pin_headers[$i], 3, 2, right_angle = true);
+
+        translate([-10, 20])
+            pin_header(pin_headers[$i], 3, 1, right_angle = true);
+
+         translate([10, 20])
+            pin_header(pin_headers[$i], 3, 3, right_angle = true);
+
+        translate([0, 30])
+            pin_header(pin_headers[$i], 8, 1);
 
         translate([0, 40])
             pin_header(pin_headers[$i], 10, 2);
 
+        translate([0, 50])
+            box_header(pin_headers[$i], 8, 1);
+
         translate([0, 60])
             box_header(pin_headers[$i], 10, 2);
 
+        translate([0, 70])
+            pin_socket(pin_headers[$i], 8, 1);
+
         translate([0, 80])
             pin_socket(pin_headers[$i], 10, 2);
 
-        translate([0, 110])
-            pin_socket(pin_headers[$i], 10, 2, right_angle = true);
+        translate([-10, 105])
+            pin_socket(pin_headers[$i], 3, 1, right_angle = true);
 
+        translate([0, 105])
+            pin_socket(pin_headers[$i], 3, 2, right_angle = true);
+
+        translate([10, 105])
+            pin_socket(pin_headers[$i], 3, 3, right_angle = true);
     }
 
+    translate([-20, 0])
+        jst_xh_header(jst_xh_header, 5);
+
+    translate([-20, 20])
+        jst_xh_header(jst_xh_header, 5, true);
+}
+
 if($preview)
     pin_headers();

tests/printed_box.scad

@@ -21,25 +21,25 @@ include <../core.scad>
 use <../printed/foot.scad>
 use <../printed/printed_box.scad>
 
-foot = [13, 5, 2, 1, M3_pan_screw, 10];
+foot = Foot(d = 13, h = 5, t = 2, r = 1, screw = M3_pan_screw);
 module foot_stl() foot(foot);
 
 wall = 2;
 top_thickness = 2;
 base_thickness = 2;
-case_inner_rad = 8;
+inner_rad = 8;
 
 width = 80;
 depth = 45;
 height = 40;
 
-box1 = ["box1",  wall, top_thickness, base_thickness, false, M2_cap_screw, case_inner_rad, [8, 1], width,  depth, height];
-box2 = ["smooth_box", wall, top_thickness, base_thickness, foot,  false,        case_inner_rad, [0, 0], width,  depth, height];
+box1 = pbox(name = "box1",       wall = wall, top_t = top_thickness, base_t = base_thickness, radius = inner_rad, size = [width, depth, height], screw = M2_cap_screw, ridges = [8, 1]);
+box2 = pbox(name = "smooth_box", wall = wall, top_t = top_thickness, base_t = base_thickness, radius = inner_rad, size = [width, depth, height], foot = foot);
 
 module box1_feet_positions() {
     clearance = 2;
     foot_r = foot_diameter(foot) / 2;
-    x_inset = case_inner_rad + foot_r - pbox_ridges(box1).y;
+    x_inset = inner_rad + foot_r - pbox_ridges(box1).y;
     z_inset = foot_r + clearance;
     h = height + base_thickness;
 
@@ -67,7 +67,7 @@ module box1_external_additions() {
 
 module box1_holes() {
     box1_feet_positions()
-        teardrop(r = screw_pilot_hole(foot_screw(foot)), h = 10, center = true);
+        teardrop_plus(r = screw_pilot_hole(foot_screw(foot)), h = 10, center = true);
 }
 
 

tests/rails.scad

@@ -25,15 +25,15 @@ use <../vitamins/nut.scad>
 sheet = 3;
 
 module rails()
-    layout([for(l = rails) carriage_width(rail_carriage(l))], 25)
+    layout([for(l = rails) carriage_width(rail_carriage(l))], 20)
         rotate(-90) {
             rail = rails[$i];
-            length = rail == MGN15 ? 260 : 200;
+            length = 200;
             screw = rail_screw(rail);
             nut = screw_nut(screw);
             washer = screw_washer(screw);
 
-            rail_assembly(rail, length, rail_travel(rail, length) / 2, $i<2 ? grey20 : "green", $i<2 ? grey20 : "red");
+            rail_assembly(rail, length, rail_travel(rail, length) / 2, $i<2 ? grey(20) : "green", $i<2 ? grey(20) : "red");
 
             rail_screws(rail, length, sheet + nut_thickness(nut, true) + washer_thickness(washer));
 

tests/ribbon_clamp.scad

@@ -16,20 +16,22 @@
 // You should have received a copy of the GNU General Public License along with NopSCADlib.
 // If not, see <https://www.gnu.org/licenses/>.
 //
-include <../utils/core/core.scad>
+include <../core.scad>
 use <../printed/ribbon_clamp.scad>
 use <../vitamins/wire.scad>
 
-ways = 20;
+ways = [8, 20];
+screws = [M2_dome_screw, M3_cap_screw];
 
 module ribbon_clamps()
-    translate([ribbon_clamp_length(ways) / 2, 0])
-        if($preview) {
-            ribbon_clamp_fastened_assembly(ways, 3);
+    for(i = [0 : len(screws) - 1])
+        translate([ribbon_clamp_length(ways[i]) / 2, i * 30])
+            if($preview) {
+                ribbon_clamp_fastened_assembly(ways[i], 3, screws[i]);
 
-            ribbon_cable(ways, 100);
-        }
-        else
-            ribbon_clamp(ways);
+                ribbon_cable(ways[i], 100);
+            }
+            else
+                ribbon_clamp(ways[i], screws[i]);
 
 ribbon_clamps();

tests/teardrops.scad

@@ -41,7 +41,10 @@ module teardrops() {
 
                         translate([20, 10])
                             semi_teardrop(h = 0, r = 3);
-                    }
+
+                        translate([20, 20])
+                            teardrop(h = 0, r = 3, truncate = false, plus = true);
+                   }
                 }
                 translate([40, 0, 1.5]) {
                     h = 3 + eps;
@@ -61,6 +64,9 @@ module teardrops() {
 
                     translate([20, 10])
                         semi_teardrop(h = h, r = 3, chamfer = chamfer);
+
+                    translate([20, 20])
+                        teardrop(h = h, r = 3, truncate = false, plus = false, chamfer = chamfer);
                 }
             }
 }

tests/thread.scad

@@ -26,27 +26,27 @@ 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;
+        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);
+        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);
+        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);
+        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([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);
-}
+        color(colour)
+            translate([80, 0])
+                thread(dia, pitch, length, profile, starts = 1, top = -1, bot = -1, female = female);
+    }
 
 let($show_threads = true)
     threads();

utils/catenary.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/>.
+//
+
+//
+//! Catenary curve to model hanging wires, etc.
+//!
+//! Although the equation of the curve is simply ```y = a cosh(x / a)``` there is no explicit formula to calculate the constant ```a``` or the range of ```x``` given the
+//! length of the cable and the end point coordinates. See <https://en.wikipedia.org/wiki/Catenary#Determining_parameters>. The Newton-Raphson method is used to find
+//! ```a``` numerically, see <https://en.wikipedia.org/wiki/Newton%27s_method>.
+//!
+//! The coordinates of the lowest point on the curve can be retrieved by calling ```catenary_points()``` with ```steps``` equal to zero.
+//
+include <core/core.scad>
+use <maths.scad>
+
+function catenary(t, a) = let(u = argsinh(t)) a * [u, cosh(u)]; //! Parametric catenary function linear along the length of the curve.
+function catenary_s(d, a) = 2 * a * sinh(d / a); //! Length of a symmetric catenary with width ```2d```.
+function catenary_ds_by_da(d, a) = 2 * sinh(d / a) - 2 * d / a * cosh(d / a); //! First derivative of the length with respect to ```a```.
+
+function catenary_find_a(d, l, a = 1, best_e = inf, best_a = 1) =  //! Find the catenary constant ```a```, given half the horizontal span and the length.
+     assert(l > 2 * d, "Not long enough to span the gap") assert(d) let(error = abs(catenary_s(d, a) - l))
+     error >= best_e && error < 0.0001 ? best_a
+                                       : catenary_find_a(d, l, max(a - (catenary_s(d, a) - l) / catenary_ds_by_da(d, a), d / argsinh(1e99)), error, a);
+
+function catenary_points(l, x, y, steps = 100) = //! Returns a list of 2D points on the curve that goes from the origin to ```(x,y)``` and has length ```l```.
+    let(
+        d = x / 2,
+        a = catenary_find_a(d, sqrt(sqr(l) - sqr(y))),   // Find a to get the correct length
+        offset = argsinh(y / catenary_s(d, a)),
+        t0 = sinh(-d / a + offset),
+        t1 = sinh( d / a + offset),
+        h = a * cosh(-d / a + offset) - a,
+        lowest = offset > d / a ? [0, 0] : offset < -d / a ? [x, y] : [d - offset * a, -h],
+        p0 = catenary(t0, a)
+    )
+    steps ? [for(t = [t0 : (t1 - t0) / steps : t1]) catenary(t, a) - p0] : lowest;

utils/core/core.scad

@@ -28,12 +28,12 @@ use <global.scad>
 
 module use_stl(name) {               //! Import an STL to make a build platter
     stl(name);
-
-    import(str("../stls/", name, ".stl"));
+    path = is_undef($target) ? "../stls/" : str("../", $target, "/stls/");
+    import(str(path, name, ".stl"));
 }
 
 module use_dxf(name) {               //! Import a DXF to make a build panel
     dxf(name);
-
-    import(str("../dxfs/", name, ".dxf"));
+    path = is_undef($target) ? "../dxfs/" : str("../", $target, "/dxfs/");
+    import(str(path, name, ".dxf"));
 }

utils/core/global.scad

@@ -31,6 +31,7 @@ function m(x)    = x * 1000.0;
 
 function sqr(x) = x * x;                                                            //! Returns the square of ```x```
 function echoit(x) = echo(x) x;                                                     //! Echo expression and return it, useful for debugging
+function no_point(str) = chr([for(c = str(str)) if(c == ".") ord("p") else ord(c)]);//! Replace decimal point in string with 'p'
 function in(list, x) = !!len([for(v = list) if(v == x) true]);                      //! Returns true if ```x``` is an element in the ```list```
 function Len(x) = is_list(x) ? len(x) : 0;                                          //! Returns the length of a list or 0 if ```x``` is not a list
 function r2sides(r) = $fn ? $fn : ceil(max(min(360/ $fa, r * 2 * PI / $fs), 5));    //! Replicates the OpenSCAD logic to calculate the number of sides from the radius

utils/core/polyholes.scad

@@ -32,33 +32,37 @@ module poly_circle(r, sides = 0) { //! Make a circle adjusted to print the corre
     circle(r = corrected_radius(r,n), $fn = n);
 }
 
-module poly_cylinder(r, h, center = false, sides = 0) //! Make a cylinder adjusted to print the correct size
+module poly_cylinder(r, h, center = false, sides = 0, chamfer = false) {//! Make a cylinder adjusted to print the correct size
     extrude_if(h, center)
         poly_circle(r, sides);
 
-module poly_ring(or, ir) { //! Make a 2D ring adjusted to have the correct internal radius
-    cir = corrected_radius(ir);
+    if(h && chamfer)
+        poly_cylinder(r + layer_height, center ? layer_height * 2 : layer_height, center, sides = sides ? sides : sides(r));
+}
+
+module poly_ring(or, ir, sides = 0) { //! Make a 2D ring adjusted to have the correct internal radius
+    cir = corrected_radius(ir, sides);
     filaments = (or - cir) / extrusion_width;
     if(filaments > 3 + eps)
         difference() {
             circle(or);
 
-            poly_circle(ir);
+            poly_circle(ir, sides);
         }
     else
         if(filaments >= 2)
             difference() {
                 offset(or - cir)
-                    poly_circle(ir);
+                    poly_circle(ir, sides);
 
-                poly_circle(ir);
+                poly_circle(ir, sides);
             }
             else
                 difference() {
-                    poly_circle(or);
+                    poly_circle(or, sides);
 
                     offset(-squeezed_wall)
-                        poly_circle(or);
+                        poly_circle(or, sides);
                 }
 }
 
@@ -66,9 +70,16 @@ module poly_tube(or, ir, h, center = false) //! Make a tube adjusted to have the
     extrude_if(h, center)
         poly_ring(or, ir);
 
-module drill(r, h = 100) //! Make a cylinder for drilling holes suitable for CNC routing, set h = 0 for circle
-    extrude_if(h)
+module drill(r, h = 100, center = true) //! Make a cylinder for drilling holes suitable for CNC routing, set h = 0 for circle
+    extrude_if(h, center)
         circle(r = corrected_radius(r, r2sides(r)));
+
+module poly_drill(r, h = 100, center = true) //! Make a cylinder for drilling holes suitable for CNC routing if cnc_bit_r is non zero, otherwise a poly_cylinder.
+    if(cnc_bit_r)
+        drill(r, h, center = true);
+    else
+        poly_cylinder(r, h, center);
+
 //
 // Horizontal slot
 //

utils/core/teardrops.scad

@@ -20,17 +20,32 @@
 //
 //! For making horizontal holes that don't need support material.
 //! Small holes can get away without it, but they print better with truncated teardrops.
+//!
+//! Using teardrop_plus() or setting the plus option on other modules will elongate the teardrop vertically by the layer height, so when sliced the staircase tips
+//! do not intrude into the circle. See <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
 //
-module teardrop(h, r, center = true, truncate = true, chamfer = 0) { //! For making horizontal holes that don't need support material, set ```truncate = false``` to make traditional RepRap teardrops that don't even need bridging
+module teardrop(h, r, center = true, truncate = true, chamfer = 0, plus = false) { //! For making horizontal holes that don't need support material, set ```truncate = false``` to make traditional RepRap teardrops that don't even need bridging
     module teardrop_2d(r, truncate) {
-        hull() {
-            circle4n(r);
-            if(truncate)
-                translate([0, r / 2])
-                    square([2 * r * (sqrt(2) - 1), r], center = true);
-            else
-                polygon([[0, 0], [eps, 0], [0, r * sqrt(2)]]);
-        }
+        er = layer_height / 2 - eps;    // Extrustion edge radius
+        R = plus ? r + er : r;          // Corrected radius
+        offset = plus ? -er : 0;        // Offset inwards
+        hull()
+            for(side = [0 : 1])
+                mirror([side, 0, 0])
+                    intersection() {
+                        hull()
+                        translate([offset, 0]) {
+                            circle4n(R);
+
+                            if(truncate)
+                                translate([0, R / 2])
+                                    square([2 * R * (sqrt(2) - 1), R], center = true);
+                            else
+                                polygon([[0, 0], [eps, 0], [0, R * sqrt(2)]]);
+                        }
+                        translate([0, -2 * R])
+                            square([R, 4 * R]);
+                    }
     }
 
     render(convexity = 5)
@@ -40,23 +55,23 @@ module teardrop(h, r, center = true, truncate = true, chamfer = 0) { //! For mak
     teardrop_chamfer(h, center, chamfer) {
         linear_extrude(eps, center = true)
             teardrop_2d(r + chamfer / 2, truncate);
+
         translate_z(-chamfer / 2)
             linear_extrude(eps, center = true)
                 teardrop_2d(r, truncate);
     }
 }
 
-module semi_teardrop(h, r, d = undef, center = true, chamfer = 0) { //! A semi teardrop in the positive Y domain
-    module semi_teardrop_2d(r, d) {
+module semi_teardrop(h, r, d = undef, center = true, chamfer = 0, plus = false) { //! A semi teardrop in the positive Y domain
+    module semi_teardrop_2d(r, d)
         intersection() {
             R = is_undef(d) ? r : d / 2;
-            teardrop(r = R, h = 0);
+            teardrop(r = R, h = 0, plus = plus);
 
             sq = R + 1;
             translate([-sq, 0])
                 square([2 * sq, sq]);
         }
-    }
 
     render(convexity = 5)
         extrude_if(h, center)
@@ -65,22 +80,21 @@ module semi_teardrop(h, r, d = undef, center = true, chamfer = 0) { //! A semi t
     teardrop_chamfer(h, center, chamfer) {
         linear_extrude(eps, center = true)
             semi_teardrop_2d(r + chamfer / 2, d);
+
         translate_z(-chamfer / 2)
             linear_extrude(eps, center = true)
                 semi_teardrop_2d(r, d);
     }
 }
 
-module teardrop_plus(h, r, center = true, truncate = true, chamfer = 0) //! Slightly bigger teardrop to allow for the 3D printing staircase effect
-    teardrop(h, r + layer_height / 4, center, truncate, chamfer);
+module teardrop_plus(h, r, center = true, truncate = true, chamfer = 0) //! Slightly elongated teardrop to allow for the 3D printing staircase effect
+    teardrop(h, r, center, truncate, chamfer, plus = true);
 
-module tearslot(h, r, w, center = true, chamfer = 0) { //! A horizontal slot that doesn't need support material
-    module tearslot_2d(r, w) {
-        hull() {
-            translate([-w / 2, 0]) teardrop(r = r, h = 0);
-            translate([w / 2, 0]) teardrop(r = r, h = 0);
-        }
-    }
+module tearslot(h, r, w, center = true, chamfer = 0, plus = false) { //! A horizontal slot that doesn't need support material
+    module tearslot_2d(r, w)
+        hull()
+            for(x = [-1, 1])
+                translate([x * w / 2, 0]) teardrop(r = r, h = 0, plus = plus);
 
     extrude_if(h, center)
         tearslot_2d(r, w);
@@ -88,19 +102,19 @@ module tearslot(h, r, w, center = true, chamfer = 0) { //! A horizontal slot tha
     teardrop_chamfer(h, center, chamfer) {
         linear_extrude(eps, center = true)
             tearslot_2d(r + chamfer / 2, w);
+
         translate_z(-chamfer / 2)
             linear_extrude(eps, center = true)
                 tearslot_2d(r, w);
     }
 }
 
-module vertical_tearslot(h, r, l, center = true, chamfer = 0) { //! A vertical slot that doesn't need support material
-    module vertical_tearslot_2d(r, l) {
-        hull() {
-            translate([0,  l / 2]) teardrop(0, r, true);
-            translate([0, -l / 2]) circle4n(r);
-        }
-    }
+module vertical_tearslot(h, r, l, center = true, chamfer = 0, plus = false) { //! A vertical slot that doesn't need support material
+    module vertical_tearslot_2d(r, l)
+        hull()
+            for(y = [-1, 1])
+                translate([0,  y * l / 2])
+                    teardrop(0, r, true, plus = plus);
 
     extrude_if(h, center)
         vertical_tearslot_2d(r, l);
@@ -108,6 +122,7 @@ module vertical_tearslot(h, r, l, center = true, chamfer = 0) { //! A vertical s
     teardrop_chamfer(h, center, chamfer) {
         linear_extrude(eps, center = true)
             vertical_tearslot_2d(r + chamfer / 2, l);
+
         translate_z(-chamfer / 2)
             linear_extrude(eps, center = true)
                 vertical_tearslot_2d(r, l);
@@ -123,4 +138,3 @@ module teardrop_chamfer(h, center, chamfer) { //! Helper module for adding chamf
                         hull()
                             children();
 }
-

utils/gears.scad

@@ -0,0 +1,138 @@
+//
+// 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/>.
+//
+
+//
+//! Utilities for making involute gears.
+//!
+//! Formulas from <https://khkgears.net/new/gear_knowledge/gear_technical_reference/involute_gear_profile.html>
+//! <https://khkgears.net/new/gear_knowledge/gear_technical_reference/calculation_gear_dimensions.html>
+//! and <https://www.tec-science.com/mechanical-power-transmission/involute-gear/calculation-of-involute-gears/>
+//!
+//! ```involute_gear_profile()``` returns a polygon that can have the bore and spokes, etc, subtracted from it before linear extruding it to 3D.
+//! Helical gears can be made using ```twist``` and bevel gears using ```scale``` parameters of ```linear_extrude()```.
+//!
+//! Gears with less than 19 teeth (when pressure angle is 20) are profile shifted to avoid undercutting the tooth root. 7 teeth is considered
+//! the practical minimum.
+//!
+//! The clearance between tip and root defaults to module / 6, but can be overridden by setting the ```clearance``` parameter.
+//!
+//! The origin of the rack is the left end of the pitch line and its width is below the pitch line. I.e. it does not include the addendum.
+//!
+//! ```involute_worm_profile()``` returns a tooth profile that can be passed to ```thread()``` to make worms.
+//
+include <core/core.scad>
+use <maths.scad>
+
+function involute(r, u) = let(a = degrees(u), c = cos(a), s = sin(a)) r * [c + u * s, s - u * c]; //! Involute of circle radius r at angle u in radians
+
+function profile_shift(z, pa) = z ? max(1 - z * sqr(sin(pa)) / 2, 0) : 0; //! Calculate profile shift for small gears
+
+function centre_distance(m, z1, z2, pa = 20) = //! Calculate distance between centres taking profile shift into account
+    let(x1 = profile_shift(z1, pa), x2 = profile_shift(z2, pa)) m * (z1/2 + z2/2 + x1 + x2);
+
+function involute_gear_od(m, z, pa = 20) = //! involute gear outside diameter given modulus, tooth count and pressure angle
+    m * (z + 2 * profile_shift(z, pa) + 2);
+
+module involute_gear_profile(m, z, pa = 20, clearance = undef, steps = 20) { //! Calculate gear profile given module, number of teeth and pressure angle
+    assert(z >= 7, "Gears must have at least 7 teeth.");
+    d = m * z;                                                  // Reference pitch circle diameter
+    x = profile_shift(z, pa);                                   // Profile shift
+    c = is_undef(clearance) ? m / 6 : clearance;                // Clearance from tip to root
+
+    base_d = d * cos(pa);                                       // Base diameter
+    root_r = d / 2 + m * (x - 1) - c;                           // Root radius (dedendum circle radius)
+    tip_d = d + 2 * m * (1 + x);                                // Tip diameter (addendum circle diameter)
+    tpa = acos(base_d / tip_d);                                 // Tip pressure angle
+    inva = tan(pa) - radians(pa);                               // Involute alpha
+    invaa = tan(tpa) - radians(tpa);                            // Involute alphaa
+    ta =  PI / (2 * z) + 2 * x * tan(pa) / z + inva - invaa;    // Tooth tip thickness angle, radians
+    crest_w = ta * tip_d;                                       // Crest width
+    umax = sqrt(sqr(tip_d / base_d) - 1);                       // Max value of the involute parameter
+
+    base_r = base_d / 2;
+    p1 = involute(base_r, 0);
+    p2 = involute(base_r, umax);
+    dist = norm(p2 - p1);                                       // distance between beginning and end of the involute curve
+
+    base_angle = 2 * acos((sqr(base_r) + sqr(tip_d / 2) - sqr(dist)) / base_r / tip_d) + degrees(2 * ta);
+    root_angle = 360 / z - base_angle;
+    root_circle_r = base_r * sin(root_angle / 2);
+
+    if(!is_undef($show_numbers) && $show_numbers) {
+        echo(d=d);
+        echo(base_d=base_d);
+        echo(tip_d=tip_d);
+        echo(tpa = tpa);
+        echo(inva=inva);
+        echo(invaa=invaa);
+        echo(x=x);
+        echo(ta=ta);
+        echo(crest_w=crest_w);
+        echo(umax = umax);
+        echo(base_angle=base_angle);
+        echo(root_angle=root_angle);
+    }
+    involute = [for(i = [0 : steps], u = umax * i / steps) involute(base_r, u)]; // involute for the bottom side of the tooth
+    truncated = [for(p = involute) if((rot2_z(-base_angle / 2) * p).y <= 0) p];  // removed any above the centreline to prevent overlap
+    reflection = reverse([for(p = truncated) rot2_z(base_angle) * [p.x, -p.y] ]); // reflect and rotate to make the top edge
+
+    root = reverse([for(a = [90 : 180 / steps : 270]) rot2_z(base_angle + root_angle / 2) * ([base_r, 0] + root_circle_r * [cos(a), sin(a)]) ]);
+    tooth = concat(truncated, reflection, root);
+    gear = concat([for(i = [0 : z - 1], p = tooth) rot2_z(i * 360 / z) * p]);
+    rotate(-base_angle / 2)
+        union() {
+            polygon(gear);
+
+            circle(root_r);
+        }
+}
+
+function involute_rack_tooth_profile(m, pa = 20, clearance = undef) = //! Calculate rack tooth profile given module and pressure angle
+    let(p = PI * m,                                     // Pitch
+        ha = m,                                         // Addendum
+        c = is_undef(clearance) ? m / 4 : clearance,    // Tip root clearance
+        hf = m + c,                                     // Dedendum
+        hw = 2 * m,                                     // Working depth
+        h = ha + hf,                                    // Tooth depth
+        crest_w = p / 2 - 2 * ha * tan(pa),             // Crest width
+        base_w = crest_w + 2 * hw * tan(pa),            // Base width
+        root_w = p - base_w,                            // Root width
+        clearance_w = root_w - 2 * c * tan(pa),         // Width of clearance without fillet
+        kx = tan(pa / 2 + 45),                          // Fillet ratio of radius and xoffset
+        pf = min(0.38 * m, kx * clearance_w / 2),       // Dedendum fillet radius
+        x = pf / kx,                                    // Fillet centre x offset from corner
+        sides = ceil(r2sides(pf) * (90 - pa) / 360),    // Fillet facets taking $fa, $fs and $fn into account
+        fillet = [ for(i = [0 : sides - 1], a = i * (90 - pa) / sides + 270) [clearance_w / 2 - x,  -hf + pf] + pf * [cos(a), sin(a)] ],
+        reflection = reverse([for(pt = fillet) [p - pt.x, pt.y] ]) // reflect for trailing edge
+    ) concat(fillet, [ [root_w / 2, -hw / 2], [p / 2 - crest_w / 2, ha], [p / 2 + crest_w / 2, ha], [p - root_w / 2, -hw / 2] ], reflection);
+
+module involute_rack_profile(m, z, w, pa = 20, clearance = undef) { //! Calculate rack profile given module, number of teeth and pressure angle
+    p = PI * m;                                     // Pitch
+    hf = 1.25 * m;                                  // Dedendum
+    tooth = involute_rack_tooth_profile(m, pa, clearance);
+    teeth = [for(i = [0 : z - 1], pt = tooth) [pt.x + i * p, pt.y] ];
+
+    polygon(concat([[0, -w], [0, -hf]], teeth, [[z * p, -hf ], [z * p, -w]])); // Add the corners
+}
+
+function involute_worm_profile(m, pa = 20, clearance = undef) = //! Calculate worm profile suitable for passing to thread()
+    let(tooth = involute_rack_tooth_profile(m),
+        pitch = PI * m,
+        y_min = min([for(p = tooth) p.y])
+    ) [for(p = tooth) [p.x - pitch / 2, p.y - y_min, 0]];   // Offset to be positive in y, centred in x and add 0 z ordintate

utils/hanging_hole.scad

@@ -39,11 +39,13 @@ module hanging_hole(z, ir, h = 100, h2 = 100) { //! Hole radius ```ir``` hanging
     infill_angle = z % (2 * layer_height) ? -45 : 45;
     below = min(z + eps, h2);
     big = 1000;
-
     render(convexity = 3) translate_z(z)
         union() {
             translate_z(2 * layer_height)
-                polyhole(ir - eps, h - 2 * layer_height);
+                if(sides(ir) > 4)
+                    polyhole(ir - eps, h - 2 * layer_height);
+                else
+                    poly_cylinder(ir, h - 2 * layer_height);
 
             difference() {
                 translate_z(-below)

utils/horiholes.scad

@@ -0,0 +1,55 @@
+//
+// 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/>.
+//
+
+//
+//! Utilities for depicting the staircase slicing of horizontal holes made with [`teardrop_plus()`](#teardrops), see <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
+//
+include <../utils/core/core.scad>
+
+function teardrop_plus_x(r, y, h) = //! Calculate the ordinate of a compensated teardrop given y and layer height.
+    let(fr = h / 2,
+        hpot = r + fr,
+        x2 = sqr(hpot) - sqr(y),
+        x = x2 > 0 ? sqrt(x2) : 0
+    )
+    max(0,
+        y < hpot / sqrt(2) ? x - fr :
+        y < hpot           ? hpot * sqrt(2) - y - fr :
+        0);
+
+module horihole(r, z, h = 0, center = true) { //! For making horizontal holes that don't need support material and are correct dimensions
+    bot_layer = floor((z - r) / layer_height);
+    top_layer = ceil((z + r) / layer_height);
+    render(convexity = 5)
+        extrude_if(h, center)
+            for(i = [bot_layer : top_layer]) {
+                Z = i * layer_height;
+                y = Z - z + layer_height / 2;
+                x = teardrop_plus_x(r, y, layer_height);
+                if(x > 0)
+                    translate([0, y])
+                        difference() {
+                            square([2 * x + layer_height, layer_height], center = true);
+
+                            for(end = [-1, 1])
+                                translate([end * (x + layer_height / 2), 0])
+                                    circle(d = layer_height, $fn = 32);
+                        }
+             }
+}

utils/layout.scad

@@ -28,6 +28,6 @@ function layout_offset(widths, i, gap = 2) = //! Calculate the offset for the ``
 
 module layout(widths, gap = 2, no_offset = false) //! Layout children passing ```$i```
     translate([no_offset ? -widths[0] / 2 : 0, 0])
-        for($i = [0 : len(widths) - 1])
+        for($i = [0 : 1 : len(widths) - 1])
             translate([layout_offset(widths, $i, gap), 0])
                 children();