-//cube_fillet([10,20,30], vertical=[3,2,0,0], top=[3,2,0,5], bottom=[3,2,0,5]);
-//cube_fillet([10,20,30], radius=2, top=[7,2,7,2]);
+module plate_screw(long=0) {
+ if (i_am_box == 0) {
+ translate([0, 0, -long]) screw(head_drop=14 + long, h=30 + long, r_head=3.6, r=1.7, $fn=24, slant=false);
+ } else {
+ translate([0, 0, -2 - long]) screw(head_drop=14 + long, h=30 + long, r_head=4.5, r=2, $fn=24, slant=true);
+ }
+}
+
+//radius of the idler assembly (to surface that touches belt, ignoring guide walls)
+function idler_assy_r_inner(idler_bearing) = (idler_bearing[0] / 2) + (6 * single_wall_width + 0.2) * idler_bearing[3];
+//outer radius of the idler assembly (to smooth side of belt)
+function idler_assy_r_outer(idler_bearing) = idler_assy_r_inner(idler_bearing) + belt_thickness + 1;
+
+
+module idler_assy(idler_bearing = [22, 7, 8, 1]) {
+
+ //bearing axle
+ translate([0,0,-1]) cylinder(h = 120, r=(idler_bearing[2] + 1) / 2, $fn=small_hole_segments, center=true);
+ //bearing shadow
+ %cylinder(h = idler_bearing[1], r=idler_bearing[0]/2, center=true);
+ //belt shadow
+ %cylinder(h = belt_width, r=idler_assy_r_outer(idler_bearing), center=true);
+
+ cylinder(h = idler_width + 1, r=idler_assy_r_outer(idler_bearing) + 0.5, center=true);
+}
+
+module belt(len, side = 0){
+ //belt. To be substracted from model
+ //len is in +Z, smooth side in +X, Y centered
+ translate([-0.5, 0, 0]) maketeeth(len);
+ translate([0, -4.5, -0.01]) cube([belt_thickness, 9, len + 0.02]);
+ if (side != 0) {
+ translate([0, -4.5 + side, -0.01]) cube_fillet([belt_thickness, 9, len + 0.02], vertical = [3, 0, 0, 0]);
+ }
+}
+
+
+module maketeeth(len){
+ //Belt teeth.
+ for (i = [0 : len / belt_tooth_distance]) {
+ translate([0, 0, i * belt_tooth_distance]) cube([2, 9, belt_tooth_distance * belt_tooth_ratio], center = true);
+ }
+}