chair-wheel-holder.scad

   1 infty = 60;
   2 eps = 0.01;
   3
   4 body_h = 4.5;
   5 d_out = 33;
   6 d_in = 15;
   7
   8 module spacer() {
   9         difference() {
  10                 cylinder(r = d_out/2, h = body_h);
  11                 translate([0, 0, -eps])
  12                         cylinder(r = d_in/2, h = body_h + 2*eps);
  13         }
  14 }
  15
  16 cube_d = 21;
  17 hole_d = 11.5;
  18 hole_d2 = 13;
  19 side_cut = 1.5;
  20
  21 module inner() {
  22         difference() {
  23                 translate([-cube_d/2, -cube_d/2, 0])
  24                         cube([cube_d, cube_d, cube_d]);
  25                 // hole
  26                 translate([0, 0, -eps])
  27                         cylinder(r = hole_d/2, h = cube_d + 2*eps);
  28                 // hole - moiddle ring
  29                 translate([0, 0, cube_d/2])
  30                 for (z = [-1, 1]) scale([1, 1, z])
  31                         cylinder(r1 = hole_d2/2, r2 = hole_d/2, h = 1.5);
  32                 // bottom cuts
  33                 for (x = [-1, 1]) scale([x, 1, 1])
  34                 translate([cube_d/2-side_cut, -infty/2, 0])
  35                 rotate([0, 45, 0])
  36                         cube(infty);
  37                 // bottom cuts
  38                 for (x = [-1, 1]) scale([x, 1, 1])
  39                 translate([cube_d/2, -infty/2, cube_d-side_cut])
  40                 rotate([0, -45, 0])
  41                         cube(infty);
  42         }
  43 }
  44
  45 spacer();
  46
  47 translate([d_out, 0, 0]) inner();