etc/button-cell-holder.scad

   1 // Simple button cell battery holder
   2 // Created 2017 Clinton Ebadi <clinton@unknownlamer.org>
   3
   4 // Released under the https://wiki.creativecommons.org/wiki/CC0
   5 // To the extent possible under law, Clinton Ebadi has waived all
   6 // copyright and related or neighboring rights to simple button cell
   7 // battery holder.
   8
   9 // Defaults have no tolerance, should be printed using flexible
  10 // filament for a snug fit
  11
  12 module holder (battery_d = 20, battery_h = 3.2, case_wall = 1.7, slot_undersize = 0.4, wire_d = 1.2, cover_pct = 0.4) {
  13      battery_h = battery_h - slot_undersize;
  14
  15      case_d = battery_d + case_wall*2;
  16      case_h = battery_h + case_wall*2;
  17
  18      %cylinder (d= battery_d, h = battery_h, center = true);
  19
  20      difference () {
  21           cylinder (d = case_d, h = case_h, center = true);
  22           cylinder (d= battery_d, h = battery_h, center = true);
  23
  24           // only cover cover_pct%
  25           translate ([-case_d/2 + case_d*cover_pct, -case_d/2, -case_h/2 - 0.01]) cube ([case_d, case_d, case_h + 0.02]);
  26
  27           // slots for wires
  28           hook_distance = -case_d/2 + case_d*cover_pct/2; // fixme: shitty name
  29           for (z = [-battery_h/2, battery_h/2]) {
  30                #translate ([-case_d/2 - 0.01, 0, z]) rotate ([0, 90, 0]) cylinder (h = case_d, d = wire_d);
  31                //#translate ([-case_d/2 - 0.01, 0, z]) rotate ([0, 90, 0]) cylinder (h = case_d * cover_pct/2, d = wire_d);
  32           }
  33
  34           // hole to bend wire up to hold in place
  35           translate ([hook_distance, 0, 0]) cylinder (h = case_h + 1, d = wire_d, center = true);
  36      }
  37 }
  38
  39 holder ($fs = 0.1, $fa = 1, slot_undersize = 0.4);