nerf.scad

   1 eps = 0.01;
   2 infty = 100;
   3
   4 wall = 1;
   5
   6 lens_d = 41.5;
   7 lens_side_l = 25;
   8 rail_in = 13.5;
   9 rail_ex = 18.2;
  10 rail_thick = 3.4;
  11 rail_depth = rail_thick + wall;
  12 body_l = 55;
  13 rail_in_l = 15;
  14
  15 beam_l = 7;
  16 beam_w = 0.8;
  17
  18 $fn = 120;
  19
  20 difference() {
  21         union() {
  22                 difference() {
  23                         union() {
  24                                 // outer cylinder
  25                                 cylinder(r = lens_d/2 + 2*wall, h = body_l);
  26                                 // rail base
  27                                 translate([-rail_ex/2-wall, -lens_d/2-rail_depth-2*wall, 0])
  28                                         cube([rail_ex+2*wall, lens_d/2+rail_depth+2*wall, body_l]);
  29                         }
  30                         // inner cylinder
  31                         translate([0, 0, -eps])
  32                                 cylinder(r = lens_d/2 + wall, h = body_l+2*eps);
  33                         // cut the top third of the cylinder
  34                         translate([-infty/2, lens_d/2*sin(30) + wall, -eps])
  35                                 cube(infty);
  36                         difference() {
  37                                 // rail_ex -wide hole
  38                                 translate([-rail_ex/2, -lens_d/2-2*wall-rail_thick, -eps])
  39                                         cube([rail_ex, rail_thick, body_l+2*eps]);
  40                                 // beam
  41                                 translate([-rail_ex/2-eps, -lens_d/2-2*wall-beam_w, rail_in_l-beam_l])
  42                                         cube([rail_ex+2*eps, beam_w+eps, beam_l]);
  43                         }
  44                         // rail_ex -wide top
  45                         translate([-rail_ex/2, -lens_d/2-2*wall-rail_depth-eps, rail_in_l])
  46                                 cube([rail_ex, rail_depth, body_l+2*eps]);
  47                         // rail-in wide hole
  48                         translate([-rail_in/2, -lens_d/2-2*wall-rail_depth-eps, -eps])
  49                                 cube([rail_in, rail_depth+eps, body_l+2*eps]);
  50                 }
  51                 // inside supports
  52                 for (angle = [-27, 27, 120, 240]) rotate([0, 0, angle])
  53                         translate([0, -lens_d/2-wall, -2*eps])
  54                                 cylinder(r = wall, h = body_l + 4*eps);
  55         }
  56         // slanted cylinder cut
  57         translate([-infty/2, cos(60)*lens_d/2, body_l+lens_side_l])
  58                 rotate([0, 90, 0])
  59                 scale([2, 1.2, 1])
  60                 cylinder(r = body_l/2, h = infty);
  61 }
  62