Hanging hole now works when the hole has only four sides.

Belt gap position is now relative to the pitch line.
Added belt_pitch_to_back().

readme.md

@@ -209,6 +209,7 @@ Only models 2D paths, so not core XY!
 To make the back of the belt run against a smooth pulley on the outside of the loop specify a negative pitch radius.
 
 By default the path is a closed loop but a gap length and position can be specified to make open loops.
+To draw the gap its XY position is specified by ```gap_pos```. ```gap_pos.z``` can be used to specify a rotation if the gap is not at the bottom of the loop.
 
 Individual teeth are not drawn, instead they are represented by a lighter colour.
 
@@ -223,6 +224,7 @@ Individual teeth are not drawn, instead they are represented by a lighter colour
 | Function | Description |
 |:--- |:--- |
 | ```belt_pitch(type)``` | Pitch in mm |
+| ```belt_pitch_height(type)``` | Offset of the pitch radius from the tips of the teeth |
 | ```belt_thickness(type)``` | Total thickness including teeth |
 | ```belt_tooth_height(type)``` | Tooth height |
 | ```belt_width(type)``` | Width in mm |
@@ -231,12 +233,12 @@ Individual teeth are not drawn, instead they are represented by a lighter colour
 | Function | Description |
 |:--- |:--- |
 | ```belt_length(points, gap = 0)``` | Compute belt length given path and optional gap |
-| ```belt_pitch_height(type)``` | Offset of the pitch radius from the tips of the teeth |
+| ```belt_pitch_to_back(type)``` | Offset of the back from the pitch radius |
 
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```belt(type, points, gap = 0, gap_pt = undef, belt_colour = grey(20)``` | 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_pos = undef, belt_colour = grey(20)``` | 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)
 
@@ -244,7 +246,7 @@ Individual teeth are not drawn, instead they are represented by a lighter colour
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
 |   1 | ```belt(GT2x6, [ ... ])``` |  Belt GT2 x 6mm x 128mm |
-|   1 | ```belt(GT2x6, [ ... ], 80, [0, 0.81])``` |  Belt GT2 x 6mm x 694mm |
+|   1 | ```belt(GT2x6, [ ... ], 80, [0, 0])``` |  Belt GT2 x 6mm x 696mm |
 |   1 | ```belt(T2p5x6, [ ... ])``` |  Belt T2.5 x 6mm x 130mm |
 |   1 | ```belt(T5x10, [ ... ])``` |  Belt T5 x 10mm x 130mm |
 |   1 | ```belt(T5x6, [ ... ])``` |  Belt T5 x 6mm x 130mm |

tests/belts.scad

@@ -60,7 +60,7 @@ 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)

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)

vitamins/belt.scad

@@ -24,29 +24,33 @@
 //! To make the back of the belt run against a smooth pulley on the outside of the loop specify a negative pitch radius.
 //!
 //! By default the path is a closed loop but a gap length and position can be specified to make open loops.
+//! To draw the gap its XY position is specified by ```gap_pos```. ```gap_pos.z``` can be used to specify a rotation if the gap is not at the bottom of the loop.
 //!
 //! Individual teeth are not drawn, instead they are represented by a lighter colour.
 //
 include <../utils/core/core.scad>
 use <../utils/rounded_polygon.scad>
+use <../utils/maths.scad>
 
 function belt_pitch(type)        = type[1]; //! Pitch in mm
 function belt_width(type)        = type[2]; //! Width in mm
 function belt_thickness(type)    = type[3]; //! Total thickness including teeth
 function belt_tooth_height(type) = type[4]; //! Tooth height
-function belt_pitch_height(type) = belt_tooth_height(type) + type[4]; //! Offset of the pitch radius from the tips of the teeth
+function belt_pitch_height(type) = type[5] + belt_tooth_height(type); //! Offset of the pitch radius from the tips of the teeth
+
+function belt_pitch_to_back(type) = belt_thickness(type) - belt_pitch_height(type); //! Offset of the back from the pitch radius
 
 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, belt_colour = grey(20), tooth_colour = grey(50)) { //! 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_pos = undef, belt_colour = grey(20), tooth_colour = grey(50)) { //! Draw a belt path given a set of points and pitch radii where the pulleys are. Closed loop unless a gap is specified
     width = belt_width(type);
     pitch = belt_pitch(type);
     thickness = belt_thickness(type);
     part = str(type[0],pitch);
-    vitamin(str("belt(", no_point(part), "x", width, ", ", points, arg(gap, 0), arg(gap_pt, undef), "): Belt ", part," x ", width, "mm x ", length, "mm"));
+    vitamin(str("belt(", no_point(part), "x", width, ", ", points, arg(gap, 0), arg(gap_pos, undef), "): Belt ", part," x ", width, "mm x ", length, "mm"));
 
     len = len(points);
 
@@ -56,24 +60,28 @@ module belt(type, points, gap = 0, gap_pt = undef, belt_colour = grey(20), tooth
 
     module shape() rounded_polygon(points, tangents);
 
+    ph = belt_pitch_height(type);
+    th = belt_tooth_height(type);
     module gap()
         if(gap)
-            translate(gap_pt)
-                square([gap, thickness + eps], center = true);
+            translate([gap_pos.x, gap_pos.y])
+                rotate(is_undef(gap_pos.z) ? 0 : gap_pos.z)
+                    translate([0, ph - thickness / 2])
+                        square([gap, thickness + eps], center = true);
 
     color(belt_colour)
         linear_extrude(width, center = true)
             difference() {
-                offset(thickness - belt_pitch_height(type)) shape();
-                offset(-belt_pitch_height(type) + belt_tooth_height(type)) shape();
+                offset(-ph + thickness ) shape();
+                offset(-ph + th) shape();
                 gap();
-
             }
+
     color(tooth_colour)
         linear_extrude(width, center = true)
             difference() {
-                offset(-belt_pitch_height(type) + belt_tooth_height(type)) shape();
-                offset(-belt_pitch_height(type)) shape();
+                offset(-ph + th) shape();
+                offset(-ph) shape();
                 gap();
             }
 }

vitamins/hot_ends.scad

@@ -33,8 +33,7 @@
 //                                                                                       h      t     s   t              t     t
 //                                                                                              h
 //
-JHeadMk4  = ["JHeadMk4",  jhead, "JHead MK4",           64,  5.1, 16,    50, grey(20),     12,    4.64, 14, [0, 2.94, -5], 20,   20];
-JHeadMk5  = ["JHeadMk5",  jhead, "JHead MK5",         51.2,  5.1, 16,    40, grey(20),     12,    4.64, 13, [0, 2.38, -5], 20,   20];
+JHeadMk5  = ["JHeadMk5",  jhead, "JHead MK5",         51.2,  4.75,16,    40, grey(20),     12,    4.64, 13, [0, 2.38, -5], 20,   20];
 E3Dv5     = ["E3Dv5",     e3d,   "E3D V5 direct",       70,  3.7, 16,  50.1, "silver",   12,    6,    15, [1, 5,  -4.5], 14.5, 28];
 E3Dv6     = ["E3Dv6",     e3d,   "E3D V6 direct",       62,  3.7, 16,  42.7, "silver",   12,    6,    15, [1, 5,  -4.5], 14,   21];
 E3D_clone = ["E3D_clone", e3d,   "E3D clone aliexpress",66,  6.8, 16,    46, "silver",   12,    5.6,  15, [1, 5,  -4.5], 14.5, 21];

vitamins/insert.scad

@@ -24,14 +24,14 @@ include <../utils/core/core.scad>
 use <../utils/quadrant.scad>
 use <../utils/thread.scad>
 
-function insert_length(type)         = type[1]; //! Length
-function insert_outer_d(type)        = type[2]; //! Outer diameter at the top
+function insert_length(type)         = type[1];     //! Length
+function insert_outer_d(type)        = type[2];     //! Outer diameter at the top
 function insert_hole_radius(type)    = type[3] / 2; //! Radius of the required hole in the plastic
-function insert_screw_diameter(type) = type[4]; //! Screw size
-function insert_barrel_d(type)       = type[5]; //! Diameter of the main barrel
-function insert_ring1_h(type)        = type[6]; //! Height of the top and middle rings
-function insert_ring2_d(type)        = type[7]; //! Diameter of the middle ring
-function insert_ring3_d(type)        = type[8]; //! Diameter of the bottom ring
+function insert_screw_diameter(type) = type[4];     //! Screw size
+function insert_barrel_d(type)       = type[5];     //! Diameter of the main barrel
+function insert_ring1_h(type)        = type[6];     //! Height of the top and middle rings
+function insert_ring2_d(type)        = type[7];     //! Diameter of the middle ring
+function insert_ring3_d(type)        = type[8];     //! Diameter of the bottom ring
 
 function insert_hole_length(type) = round_to_layer(insert_length(type));
 
@@ -42,12 +42,12 @@ module insert(type) { //! Draw specified insert
     chamfer1 = (insert_ring2_d(type) - insert_barrel_d(type)) / 2;
     chamfer2 = (insert_ring3_d(type) - insert_barrel_d(type)) / 2;
     ring2_h = ring1_h + chamfer1;
-    gap = (length - ring1_h - ring2_h- chamfer2) / 3;
+    gap = (length - ring1_h - ring2_h - chamfer2) / 3;
 
     vitamin(str("insert(", type[0], "): Heatfit insert M", insert_screw_diameter(type)));
     $fn = 64;
     thread_d = insert_screw_diameter(type);
-    explode(20, offset =[0, 0, -5]) translate_z(eps) vflip() {
+    explode(20, offset = [0, 0, -5]) translate_z(eps) vflip() {
         r1 = thread_d / 2;
         r2 = insert_barrel_d(type) / 2;
         r3 = insert_ring3_d(type) / 2;

vitamins/jhead.scad

@@ -29,7 +29,6 @@ include <zipties.scad>
 use <wire.scad>
 use <../utils/tube.scad>
 
-MK4_heater = [ 12.76, 15.88, 8.22, (15.88 / 2 - 4.5), (12.76 / 2 - 0.5 - 2.5 / 2),  (-15.88 / 2 + 5), 9.5, 3];
 MK5_heater = [ 12.76, 12.76, 8.22, (12.76 / 2 - 3.75), (12.76 / 2 - 0.5 - 2.5 / 2), (-12.76 / 2 + 4), 8,   2];
 
 function heater_width(type)  = type[0];
@@ -71,7 +70,7 @@ module heater_block(type, resistor, thermistor) {
         cone_start_r = nozzle_cone(type) / 2;
         straight = 1;
         nozzle_r = 0.4 / 2;
-        translate_z(-h / 2) vflip()
+        translate([nozzle_x(type), 0, -h / 2]) vflip()
             rotate_extrude()
                 polygon([
                     [nozzle_r,     0],
@@ -86,7 +85,7 @@ module heater_block(type, resistor, thermistor) {
 module jhead_hot_end(type, filament) {
     resistor = RIE1212UB5C5R6;
     thermistor = Epcos;
-    heater = type == JHeadMk4 ? MK4_heater : MK5_heater;
+    heater = MK5_heater;
 
     insulator_length = hot_end_insulator_length(type);
     inset = hot_end_inset(type);
@@ -106,7 +105,7 @@ module jhead_hot_end(type, filament) {
 
                     square([hot_end_insulator_diameter(type) / 2 - chamfer, insulator_length]);
                 }
-                square([3.2 / 2, insulator_length]);
+                square([(filament + 0.2) / 2, insulator_length]);
 
                 translate([hot_end_groove_dia(type) / 2, insulator_length - hot_end_inset(type) - hot_end_groove(type)])
                     square([100, hot_end_groove(type)]);
@@ -122,7 +121,7 @@ module jhead_hot_end(type, filament) {
 module jhead_hot_end_assembly(type, filament, naked = false) { //! Assembly with resistor, thermistor, tape, sleaving and ziptie
     resistor = RIE1212UB5C5R6;
     thermistor = Epcos;
-    heater = type == JHeadMk4 ? MK4_heater : MK5_heater;
+    heater = MK5_heater;
 
     insulator_length = hot_end_insulator_length(type);
     inset = hot_end_inset(type);