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, $fn = 0, $fa = 12, $fs = 2, convexity = 4) {
				text(text = "Y", size = 22, spacing = 1, font = "Liberation Sans:style=bold", direction = "ltr", language = "en", script = "Latn", halign = "center", valign = "center", $fn = 0, $fa = 12, $fs = 2);
			}
		}
	}
}

