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 | module roundedBox3dSimple() {
    minkowski() {
        cube([10,10,5]);
        cylinder(r=5, h=5);
    }
}
module roundedBox3dCut() {
    minkowski() {
        difference() {
            cube([10,10,5]);
            cube([5,5,5]);
        }
        cylinder(r=5, h=5);
    }
}
module roundedBox3dHole() {
    minkowski() {
        difference() {
            cube([10,10,5], center=true);
            cube([8,8,10], center=true);
        }
        cylinder(r=2);
    }
}
translate([-20,30,0]) roundedBox3dHole();
translate([0,25,0]) roundedBox3dCut();
translate([25,25,0]) roundedBox3dSimple();
// Empty
minkowski();
// No children
minkowski() { }
 |