include <xy_drill.scad>
x_mm_princ=140;
y_mm_princ=280;
difference(){
    square([x_mm_princ,y_mm_princ]);
    translate([10,10])
        xy_drill(x_step=x_mm_princ-20,y_step=y_mm_princ-20);
    translate([(x_mm_princ-55)/2,10])
        xy_drill();
    translate([140-42.5-24-10,280-45])
        xy_drill(y_num_drill=1,x_step=42.5);
}