group() {
	rotate_extrude(file = "", cache = "0.0", layer = "", origin = [ 0 0 ], scale = 1, convexity = 1, $fn = 0, $fa = 12, $fs = 1) {
		multmatrix([[1, 0, 0, 20], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
			circle($fn = 0, $fa = 12, $fs = 1, r = 10);
		}
	}
}