group() {
group() {
	group() {
		hull() {
			multmatrix([[1, 0, 0, 15], [0, 1, 0, 10], [0, 0, 1, 0], [0, 0, 0, 1]]) {
				circle($fn = 0, $fa = 12, $fs = 1, r = 10);
			}
			difference() {
				circle($fn = 0, $fa = 12, $fs = 1, r = 10);
				circle($fn = 0, $fa = 12, $fs = 1, r = 5);
			}
		}
	}
	multmatrix([[1, 0, 0, 40], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		group() {
			hull() {
				multmatrix([[1, 0, 0, 15], [0, 1, 0, 10], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					circle($fn = 0, $fa = 12, $fs = 1, r = 10);
				}
				circle($fn = 0, $fa = 12, $fs = 1, r = 10);
			}
		}
	}
	multmatrix([[1, 0, 0, 0], [0, 1, 0, 40], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		group() {
			hull() {
				multmatrix([[1, 0, 0, 15], [0, 1, 0, 10], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					cylinder($fn = 0, $fa = 12, $fs = 1, h = 10, r1 = 1, r2 = 1, center = false);
				}
				difference() {
					cylinder($fn = 0, $fa = 12, $fs = 1, h = 10, r1 = 1, r2 = 1, center = false);
					cylinder($fn = 0, $fa = 12, $fs = 1, h = 5, r1 = 1, r2 = 1, center = false);
				}
			}
		}
	}
	multmatrix([[1, 0, 0, 40], [0, 1, 0, 40], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		group() {
			hull() {
				multmatrix([[1, 0, 0, 15], [0, 1, 0, 10], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					cylinder($fn = 0, $fa = 12, $fs = 1, h = 1, r1 = 10, r2 = 10, center = false);
				}
				cylinder($fn = 0, $fa = 12, $fs = 1, h = 1, r1 = 10, r2 = 10, center = false);
			}
		}
	}
}}