1group() {
2 difference() {
3 cube(size = [5, 13, 18], center = true);
4 group() {
5 multmatrix([[0, 0, 1, 0], [0, 1, 0, 0], [-1, 0, 0, 0], [0, 0, 0, 1]]) {
6 cylinder($fn = 0, $fa = 12, $fs = 2, h = 20, r1 = 5, r2 = 5, center = true);
7 }
8 }
9 }
10}
11
12