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// 2D child
projection(cut=true) { square(); }
projection(cut=true) translate([20,0,0]) cube(10, center=true);
// Boundary case: clipping the top of a cube
translate([0,20,0]) projection(cut=true) translate([0,0,-4.999999]) cube(10, center=true);
// holes
translate([0,-10,0]) projection(cut=true) {
union() {
difference() { cube(5,center=true); cube(4,center=true); }
translate([2.1,2.1]) difference() { cube(5,center=true); cube(4,center=true); }
}
}
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