| 1 | // super simple canister |
| 2 | // 2018 Clinton Ebadi |
| 3 | |
| 4 | inner_d = 20; |
| 5 | inner_h = 20; |
| 6 | cap_inner_h = 12; |
| 7 | cap_overlap = 10; |
| 8 | cap_tolerance = 0.5; |
| 9 | |
| 10 | wall = 2; |
| 11 | base = 1; |
| 12 | sides = 6; |
| 13 | |
| 14 | |
| 15 | // calculated |
| 16 | outer_d = inner_d + wall*2; |
| 17 | outer_h = inner_h + wall - cap_inner_h + cap_overlap; |
| 18 | |
| 19 | cap_outer_d = outer_d + wall*2; |
| 20 | cap_outer_h = cap_inner_h + base; |
| 21 | |
| 22 | cap_bump_size = wall/2; |
| 23 | cap_bump_h = cap_bump_size * 2; |
| 24 | cap_bump_offset = cap_bump_h + 2; |
| 25 | |
| 26 | echo (cap_bump_offset); |
| 27 | |
| 28 | |
| 29 | // other asserts, if I care enough... |
| 30 | assert (cap_inner_h > cap_overlap); |
| 31 | assert (cap_outer_h - cap_bump_offset > base); |
| 32 | |
| 33 | |
| 34 | //$fa = 0.1; |
| 35 | //$fs = 0.1; |
| 36 | |
| 37 | canister_base (); |
| 38 | translate ([cap_outer_d + 1, 0, 0,]) canister_cap (); |
| 39 | |
| 40 | //cap_bump (); |
| 41 | |
| 42 | // inner |
| 43 | /* module cap_bump () { */ |
| 44 | /* $fn = sides; */ |
| 45 | /* cap_bump_d = outer_d+cap_bump_size*2; */ |
| 46 | |
| 47 | /* difference () { */ |
| 48 | /* circle (d=cap_bump_d); */ |
| 49 | /* circle (d=outer_d); */ |
| 50 | /* } */ |
| 51 | |
| 52 | /* /\* difference () { *\/ */ |
| 53 | /* /\* cylinder (h=cap_bump_h, d=cap_bump_d, center=true); *\/ */ |
| 54 | /* /\* cylinder (h=cap_bump_h+1, d=outer_d, center=true); *\/ */ |
| 55 | /* /\* } *\/ */ |
| 56 | |
| 57 | /* /\* rotate_extrude () *\/ */ |
| 58 | /* /\* union () { *\/ */ |
| 59 | /* /\* translate ([cap_bump_d/2, 0, 0]) *\/ */ |
| 60 | /* /\* rotate ([0, 180, 0]) circle (cap_bump_size, $fn=3); *\/ */ |
| 61 | /* /\* } *\/ */ |
| 62 | /* } */ |
| 63 | |
| 64 | module cap_bump () { |
| 65 | cap_bump_d = outer_d+cap_bump_size/2; |
| 66 | hull () { |
| 67 | translate ([0, 0, 0]) |
| 68 | cylinder (d = cap_bump_d, h = cap_bump_h/3, $fn = sides); |
| 69 | translate ([0, 0, cap_bump_h/3]) |
| 70 | cylinder (d = cap_bump_d + cap_bump_size, h = cap_bump_h/3, $fn = sides); |
| 71 | translate ([0, 0, cap_bump_h/3*2]) |
| 72 | cylinder (d = cap_bump_d, h = cap_bump_h/3, $fn = sides); |
| 73 | } |
| 74 | /* cylinder (d = cap_bump_d + cap_bump_size, h = cap_bump_h, $fn = sides); */ |
| 75 | /* translate ([0, 0, -cap_bump_h]) cylinder (d = inner_d, h = cap_bump_h*2+0.1, $fn = sides); */ |
| 76 | /* } */ |
| 77 | /* sphere_d = (cap_bump_h+0.1); */ |
| 78 | /* translate ([cap_bump_d/2-cap_bump_size, 0, cap_bump_h/2]) sphere (d = sphere_d); */ |
| 79 | /* } */ |
| 80 | |
| 81 | /* minkowski () { */ |
| 82 | /* cylinder (d = outer_d, h = cap_bump_size*2, $fn = sides); */ |
| 83 | /* sphere (d = cap_bump_size); */ |
| 84 | /* } */ |
| 85 | /* rotate_extrude () { */ |
| 86 | /* translate ([inner_d/2, 0, 0]) circle (cap_bump_size); */ |
| 87 | /* } */ |
| 88 | } |
| 89 | |
| 90 | module canister_base () { |
| 91 | difference () { |
| 92 | union () { |
| 93 | cylinder (d = outer_d, h = outer_h, $fn = sides); |
| 94 | translate ([0, 0, outer_h - cap_overlap + cap_bump_offset]) cap_bump (); |
| 95 | } |
| 96 | translate ([0, 0, base]) cylinder (d = inner_d, h = outer_h + 1, $fn = sides); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | module canister_cap () { |
| 101 | tolerance_pct = 1.05; |
| 102 | difference () { |
| 103 | cylinder (d = cap_outer_d, h = cap_outer_h, $fn = sides); |
| 104 | translate ([0, 0, base]) cylinder (d = outer_d + cap_tolerance, h = cap_outer_h+1, $fn = sides); |
| 105 | translate ([0, 0, cap_outer_h - cap_bump_offset]) scale ([tolerance_pct, tolerance_pct, tolerance_pct]) cap_bump (); |
| 106 | } |
| 107 | } |