// super simple canister // 2018 Clinton Ebadi inner_d = 20; inner_h = 20; cap_inner_h = 12; cap_overlap = 10; cap_tolerance = 0.5; wall = 2; base = 1; sides = 6; // calculated outer_d = inner_d + wall*2; outer_h = inner_h + wall - cap_inner_h + cap_overlap; cap_outer_d = outer_d + wall*2; cap_outer_h = cap_inner_h + base; cap_bump_size = wall/2; cap_bump_h = cap_bump_size * 2; cap_bump_offset = cap_bump_h + 2; echo (cap_bump_offset); // other asserts, if I care enough... assert (cap_inner_h > cap_overlap); assert (cap_outer_h - cap_bump_offset > base); //$fa = 0.1; //$fs = 0.1; canister_base (); translate ([cap_outer_d + 1, 0, 0,]) canister_cap (); //cap_bump (); // inner /* module cap_bump () { */ /* $fn = sides; */ /* cap_bump_d = outer_d+cap_bump_size*2; */ /* difference () { */ /* circle (d=cap_bump_d); */ /* circle (d=outer_d); */ /* } */ /* /\* difference () { *\/ */ /* /\* cylinder (h=cap_bump_h, d=cap_bump_d, center=true); *\/ */ /* /\* cylinder (h=cap_bump_h+1, d=outer_d, center=true); *\/ */ /* /\* } *\/ */ /* /\* rotate_extrude () *\/ */ /* /\* union () { *\/ */ /* /\* translate ([cap_bump_d/2, 0, 0]) *\/ */ /* /\* rotate ([0, 180, 0]) circle (cap_bump_size, $fn=3); *\/ */ /* /\* } *\/ */ /* } */ module cap_bump () { cap_bump_d = outer_d+cap_bump_size/2; hull () { translate ([0, 0, 0]) cylinder (d = cap_bump_d, h = cap_bump_h/3, $fn = sides); translate ([0, 0, cap_bump_h/3]) cylinder (d = cap_bump_d + cap_bump_size, h = cap_bump_h/3, $fn = sides); translate ([0, 0, cap_bump_h/3*2]) cylinder (d = cap_bump_d, h = cap_bump_h/3, $fn = sides); } /* cylinder (d = cap_bump_d + cap_bump_size, h = cap_bump_h, $fn = sides); */ /* translate ([0, 0, -cap_bump_h]) cylinder (d = inner_d, h = cap_bump_h*2+0.1, $fn = sides); */ /* } */ /* sphere_d = (cap_bump_h+0.1); */ /* translate ([cap_bump_d/2-cap_bump_size, 0, cap_bump_h/2]) sphere (d = sphere_d); */ /* } */ /* minkowski () { */ /* cylinder (d = outer_d, h = cap_bump_size*2, $fn = sides); */ /* sphere (d = cap_bump_size); */ /* } */ /* rotate_extrude () { */ /* translate ([inner_d/2, 0, 0]) circle (cap_bump_size); */ /* } */ } module canister_base () { difference () { union () { cylinder (d = outer_d, h = outer_h, $fn = sides); translate ([0, 0, outer_h - cap_overlap + cap_bump_offset]) cap_bump (); } translate ([0, 0, base]) cylinder (d = inner_d, h = outer_h + 1, $fn = sides); } } module canister_cap () { tolerance_pct = 1.05; difference () { cylinder (d = cap_outer_d, h = cap_outer_h, $fn = sides); translate ([0, 0, base]) cylinder (d = outer_d + cap_tolerance, h = cap_outer_h+1, $fn = sides); translate ([0, 0, cap_outer_h - cap_bump_offset]) scale ([tolerance_pct, tolerance_pct, tolerance_pct]) cap_bump (); } }