group() {
	rotate_extrude(convexity = 1, $fn = 0, $fa = 12, $fs = 2);
	rotate_extrude(convexity = 1, $fn = 0, $fa = 12, $fs = 2);
	rotate_extrude(convexity = 1, $fn = 0, $fa = 12, $fs = 2) {
		cube(size = [1, 1, 1], center = false);
	}
	linear_extrude(height = 10, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
		square(size = [10, 10], center = false);
	}
	multmatrix([[1, 0, 0, 19], [0, 1, 0, 5], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 10, center = true, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			difference() {
				circle($fn = 0, $fa = 12, $fs = 2, r = 5);
				circle($fn = 0, $fa = 12, $fs = 2, r = 3);
			}
		}
	}
	multmatrix([[1, 0, 0, 31.5], [0, 1, 0, 2.5], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 10, center = false, convexity = 1, twist = -45, slices = 3, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			polygon(points = [[-5, -2.5], [5, -2.5], [0, 2.5]], paths = undef, convexity = 1);
		}
	}
	multmatrix([[1, 0, 0, 0], [0, 1, 0, 20], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 20, center = false, convexity = 1, twist = 30, slices = 2, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			difference() {
				square(size = [10, 10], center = false);
				multmatrix([[1, 0, 0, 1], [0, 1, 0, 1], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					square(size = [8, 8], center = false);
				}
			}
		}
	}
	multmatrix([[1, 0, 0, 19], [0, 1, 0, 20], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 20, center = false, convexity = 1, twist = 45, slices = 10, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [10, 10], center = false);
		}
	}
	multmatrix([[1, 0, 0, 0], [0, 1, 0, -15], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 5, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [10, 10], center = false);
		}
	}
	multmatrix([[1, 0, 0, -25], [0, 1, 0, -10], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 10, center = false, convexity = 1, scale = [2, 2], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [5, 5], center = true);
		}
	}
	multmatrix([[1, 0, 0, -15], [0, 1, 0, 20], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 20, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [10, 10], center = false);
		}
	}
	multmatrix([[1, 0, 0, -10], [0, 1, 0, 5], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 15, center = false, convexity = 1, scale = [0, 0], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [10, 10], center = true);
		}
	}
	multmatrix([[1, 0, 0, -15], [0, 1, 0, -15], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 10, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [10, 10], center = false);
		}
	}
	multmatrix([[1, 0, 0, 0], [0, 1, 0, -25], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(height = 0, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
			square(size = [10, 10], center = true);
		}
	}
}