--- /dev/null
+$fn=100;
+difference() {
+cube([30,30, 10], true);
+ cylinder(20,3.175/2,3.175/2);
+ translate([5,0,-10]) cylinder(50,3.175/2,3.175/2);
+ translate([5,5,-10]) cylinder(20,3/2,3/2);
+ translate([0,5,-10]) cylinder(20,3.2/2,3.2/2);
+ translate([10,0,-10]) cylinder(20,4/2,4/2);
+
+}
\ No newline at end of file