towelbar-antislide.scad

   1 infty=200;
   2 eps=0.01;
   3
   4 bar_diam = 20;
   5 body_h = 7;
   6 body_l = 150;
   7
   8 wall = 1.5;
   9
  10 spike_w_bot = 1;
  11 spike_w_top = 6;
  12 spike_l = 5;
  13
  14 spike_count = 8;
  15 spike_dist = body_l/(spike_count + 1);
  16
  17 module spike() {
  18         hull() {
  19                 translate([-spike_w_top/2, 0, body_h/2-eps])
  20                         cube([spike_w_top, bar_diam/2+wall/2, eps]);
  21                 translate([-spike_w_bot/2, 0, -body_h/2])
  22                         cube([spike_w_bot, bar_diam/2 + wall + spike_l, eps]);
  23         }
  24 }
  25
  26 difference() {
  27         union() {
  28                 translate([-body_l/2, 0, 0])
  29                         rotate([0, 90, 0])
  30                                 cylinder(r = bar_diam/2 + wall, h = body_l);
  31                 for (i = [-spike_count/2:1:spike_count/2])
  32                         translate([i*spike_dist, 0, 0]) spike();
  33         }
  34
  35         // tube hole
  36         translate([-body_l/2-eps, 0, 0])
  37                 rotate([0, 90, 0])
  38                         cylinder(r = bar_diam/2, h = body_l + 2*eps);
  39         // cut the bottom
  40         translate([-infty/2, -infty/2, -infty-body_h/2]) cube(infty);
  41         // cut the top
  42         translate([-infty/2, -infty/2, body_h/2]) cube(infty);
  43         // cut the rear half
  44         translate([-infty/2, -infty, -infty/2]) cube(infty);
  45 }