fragments = 36;
d=3.96;
h=3;

module pcb() {
    color("green") {
        difference(){
            cube(size = [170,170,h], center = false);
            // mini-itx holes
            translate([6.35,6.35+22.86,0])
                cylinder(5, d/2, d/2, $fn = fragments, center=false);
            translate([6.35,6.35+154.94,0])
                cylinder(5, d/2, d/2, $fn = fragments, center=false);
            translate([6.35+157.48,6.35,0])
                cylinder(5, d/2, d/2, $fn = fragments, center=false);
            translate([6.35+157.48,6.35+154.94,0])
                cylinder(5, d/2, d/2, $fn = fragments, center=false);
        }
    }
}