hull();
	hull();
	hull() {
		cylinder($fn = 0, $fa = 12, $fs = 2, h = 1, r1 = 10, r2 = 10, center = false);
		multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 10], [0, 0, 0, 1]]) {
			cube(size = [5, 5, 5], center = true);
		}
	}
	multmatrix([[1, 0, 0, 25], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		hull() {
			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 10], [0, 0, 0, 1]]) {
				cylinder($fn = 0, $fa = 12, $fs = 2, h = 1, r1 = 3, r2 = 3, center = false);
			}
			difference() {
				cylinder($fn = 0, $fa = 12, $fs = 2, h = 4, r1 = 10, r2 = 10, center = true);
				cylinder($fn = 0, $fa = 12, $fs = 2, h = 5, r1 = 5, r2 = 5, center = true);
			}
		}
	}