filamentspool.scad

   1
   2 slop=0.5;
   3
   4 prongthick=5;
   5 prongwidth=5;
   6 ratchetstep=15;
   7 ratchettooth=3;
   8 ratchettoothheight=5;
   9 ratchettoothsmoothr=1;
  10 ratchettoothslope=0.75;
  11 overlap=0.5;
  12
  13 armendwallthick=2.5;
  14 armendbasethick=1.2;
  15
  16 include <doveclip.scad>
  17
  18 module ArmEnd(length=120){
  19   channelwidth = prongthick + slop;
  20   channeldepth = prongwidth + ratchettoothheight;
  21   totalwidth = armendwallthick*2 + channelwidth;
  22   totalheight = channeldepth + armendbasethick;
  23
  24   translate([ratchettoothsmoothr, channelwidth/2, -armendbasethick]) {
  25     rotate([0,0,-90])
  26       DoveClipPairBase(h=totalheight);
  27   }
  28
  29   for (dx = [0 : ratchetstep : length]) translate([dx,0,0]) {
  30     difference(){
  31       translate([0, -armendwallthick, -armendbasethick])
  32         cube([ratchetstep+overlap, totalwidth, totalheight]);
  33       translate([-1, 0, 0])
  34         cube([ratchetstep+overlap+2, channelwidth, channeldepth+1]);
  35     }
  36     translate([ratchettoothsmoothr+0.5, armendwallthick/2, 0]) minkowski(){
  37       rotate([90,0,0])
  38         cylinder($fn=20, r=ratchettoothsmoothr, h=armendwallthick);
  39       multmatrix([      [       1, 0, ratchettoothslope, 0      ],
  40                         [       0,      1,      0,      0       ],
  41                         [       0,      0,      1,      0       ],
  42                         [       0,      0,      0,      1       ]])
  43         cube([ratchettooth - ratchettoothsmoothr*2,
  44               channelwidth, ratchettoothheight]);
  45     }
  46   }
  47 }
  48
  49 ArmEnd();