group() {
	group() {
		difference() {
			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 7.5], [0, 0, 0, 1]]) {
				cube(size = [30, 30, 15], center = true);
			}
			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 5], [0, 0, 0, 1]]) {
				linear_extrude(height = 30, center = false, convexity = 4, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
					text(text = "M", size = 22, spacing = 1, font = "Bitstream Vera Sans", direction = "ltr", language = "en", script = "latin", halign = "center", valign = "center", $fn = 0, $fa = 12, $fs = 2);
				}
			}
		}
	}
	group();
}
