module thing() { $fa = 30; difference() { sphere(r = 25); cylinder(h = 62.5, r1 = 12.5, r2 = 6.25, center = true); rotate(90, [ 1, 0, 0 ]) cylinder(h = 62.5, r1 = 12.5, r2 = 6.25, center = true); rotate(90, [ 0, 1, 0 ]) cylinder(h = 62.5, r1 = 12.5, r2 = 6.25, center = true); } } module demo_proj() { linear_extrude(center = true, height = 0.5) projection(cut = false) thing(); % thing(); } module demo_cut() { for (i=[-20:5:+20]) { rotate(-30, [ 1, 1, 0 ]) translate([ 0, 0, -i ]) linear_extrude(center = true, height = 0.5) projection(cut = true) translate([ 0, 0, i ]) rotate(+30, [ 1, 1, 0 ]) thing(); } % thing(); } echo(version=version()); translate([ -30, 0, 0 ]) demo_proj(); translate([ +30, 0, 0 ]) demo_cut(); // Written by Clifford Wolf and Marius // Kintel // // To the extent possible under law, the author(s) have dedicated all // copyright and related and neighboring rights to this software to the // public domain worldwide. This software is distributed without any // warranty. // // You should have received a copy of the CC0 Public Domain // Dedication along with this software. // If not, see .