cnc/3D/drill_test.scad

   1 $fn=100;
   2 difference() {
   3 cube([30,30, 10], true);
   4     cylinder(20,3.175/2,3.175/2);
   5     translate([5,0,-10]) cylinder(50,3.175/2,3.175/2);
   6     translate([5,5,-10]) cylinder(20,3/2,3/2);
   7     translate([0,5,-10]) cylinder(20,3.2/2,3.2/2);
   8     translate([10,0,-10]) cylinder(20,4/2,4/2);
   9
  10 }