nerf.scad

   1 eps = 0.01;
   2 infty = 100;
   3
   4 wall = 1;
   5 cyl_wall = 1.5;
   6
   7 lens_d = 41.5 - 1.5;
   8 lens_side_l = 25;
   9 rail_in = 13.5;
  10 rail_ex = 18.6;
  11 rail_thick = 3.6;
  12 rail_depth = rail_thick + wall;
  13 body_l = 55;
  14 rail_in_l = 15;
  15
  16 beam_l = 7;
  17 beam_w = 0.8;
  18
  19 $fn = 120;
  20
  21 difference() {
  22         union() {
  23                 difference() {
  24                         union() {
  25                                 // outer cylinder
  26                                 cylinder(r = lens_d/2 + 2*cyl_wall, h = body_l);
  27                                 // rail base
  28                                 translate([-rail_ex/2-wall, -lens_d/2-rail_depth-2*wall, 0])
  29                                         cube([rail_ex+2*wall, lens_d/2+rail_depth+2*wall, body_l]);
  30                         }
  31                         // inner cylinder
  32                         translate([0, 0, -eps])
  33                                 cylinder(r = lens_d/2 + wall, h = body_l+2*eps);
  34                         // cut the top third of the cylinder
  35                         translate([-infty/2, lens_d/2*sin(30) + wall, -eps])
  36                                 cube(infty);
  37                         difference() {
  38                                 // rail_ex -wide hole
  39                                 translate([-rail_ex/2, -lens_d/2-2*wall-rail_thick, -eps])
  40                                         cube([rail_ex, rail_thick, body_l+2*eps]);
  41                                 // beam
  42                                 translate([-rail_ex/2-eps, -lens_d/2-2*wall-beam_w, rail_in_l-beam_l])
  43                                         cube([rail_ex+2*eps, beam_w+eps, beam_l]);
  44                         }
  45                         // rail_ex -wide top
  46                         translate([-rail_ex/2, -lens_d/2-2*wall-rail_depth-eps, rail_in_l])
  47                                 cube([rail_ex, rail_depth, body_l+2*eps]);
  48                         // rail-in wide hole
  49                         translate([-rail_in/2, -lens_d/2-2*wall-rail_depth-eps, -eps])
  50                                 cube([rail_in, rail_depth+eps, body_l+2*eps]);
  51                 }
  52                 // inside supports
  53                 for (angle = [-27, 27, 120, 240]) rotate([0, 0, angle])
  54                         translate([0, -lens_d/2-cyl_wall, -2*eps])
  55                                 cylinder(r = cyl_wall, h = body_l + 4*eps);
  56         }
  57         // slanted cylinder cut
  58         translate([-infty/2, cos(60)*lens_d/2, body_l+lens_side_l])
  59                 rotate([0, 90, 0])
  60                 scale([2, 1.2, 1])
  61                 cylinder(r = body_l/2, h = infty);
  62 }
  63