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([1.651, 18.542,0]) cylinder(100,1.25,1.25); translate([23.749, 18.542,0]) cylinder(100,1.25,1.25); }