width=25.400; length=33.274; height=0.5; translate([-width/2, -length/2, 0]) difference() { translate([0, 0, 0]) cube([width,length,height]); translate([1.524, 18.415,0]) cylinder(100,1.20,1.20); translate([23.876, 18.415,0]) cylinder(100,1.20,1.20); translate([0, 10.8, 0]) cube([4.3,6.350,height]); }