10 base_l = gear_l + 3.5;
12 base_beam_w = spring_l + 2;
17 rear_beam_w = rear_spring_l + 3;
19 rear_spring_bot_w = 7;
22 side_spring_bot_w = 3.5;
27 hook_h = base_h + base_reinf_h/2;
32 translate([0, -base_w/2, 0])
33 cube([base_beam_w, base_w, base_h]);
34 translate([base_beam_w/2-base_reinf_w/2, -base_w/2, base_h-eps])
35 cube([base_reinf_w, base_w, base_reinf_h + eps]);
40 translate([base_beam_w/2, -rear_beam_w/2, 0])
41 cube([base_l - base_beam_w/2, rear_beam_w, base_h]);
42 translate([base_beam_w/2, -base_reinf_w/2, base_h-eps])
43 cube([base_l - base_beam_w/2, base_reinf_w, base_reinf_h + eps]);
48 translate([gear_l-rear_spring_bot_w/2, -rear_spring_l/2, base_h])
49 cube([rear_spring_bot_w, rear_spring_l, eps]);
50 translate([gear_l-rear_spring_w/2, -rear_spring_l/2, hook_h+hook_in+hook_wall-eps])
51 cube([rear_spring_w, rear_spring_l, eps]);
55 for (y = [-1, 1]) scale([1, y, 1]) intersection() {
56 translate([0, gear_w/2, eps]) rotate([0, 0, -20])
57 translate([-10, 0, 0]) hull() {
58 cube([20, side_spring_bot_w, base_h-eps]);
59 cube([20, side_spring_w, hook_h + hook_in + hook_wall-eps]);
62 translate([0, -base_w/2, base_h/2])
63 cube([base_beam_w, base_w, infty]);
64 // cut the front sides
65 translate([0, gear_w/2 + 0.8, eps])
76 translate([gear_l, 0, hook_h+hook_in/2])
78 translate([0, 0, -rear_beam_w/2-eps])
79 cylinder(h = rear_beam_w+2*eps, r = hook_in/2, $fn = 6);
80 // rear slot above the hole
81 translate([gear_l-rear_slot_w/2, -rear_beam_w/2+eps, hook_h+hook_in/2])
82 cube([rear_slot_w, rear_beam_w+2*eps, infty]);
84 for (y = [-1, 1]) scale([1, y, 1]) {
85 translate([0, gear_w/2, hook_h+hook_in/2]) {
87 translate([0, 0, -10])
88 cylinder(r = hook_in/2, h = 20, $fn = 6);