translate([0, 0, 13.5]) cube(size = [28,28,27], center = true); difference(){ cube(size = [94.2,94.2,10], center = true); translate([24.5, -16, 5]) cube(size = [21.5,59.5,10], center = true); translate([16, 24.5, 5]) cube(size = [59.5,21.5,10], center = true); translate([-24.5, 16, 5]) cube(size = [21.5,59.5,10], center = true); translate([-16, -24.5, 5]) cube(size = [59.5,21.5,10], center = true); }