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// Creates the same "non-manifold" object (sharing one edge) using two techniques:
// o linear_extrude of two 2D objects
// o union of two linear_extrudes
//
// Subsequently cuts away the non-manifold part:
// -> the first technique fails, the second one succeeds
//
module cutoff() {
difference() {
children();
translate([0,0,2.5]) cube(2, center=true);
}
}
cutoff() {
linear_extrude(height=3, scale=[0,1], convexity=2) {
translate([1,0,0]) square(1,true);
translate([-1,0,0]) square(1,true);
}
}
translate([0,2,0]) cutoff() {
linear_extrude(height=3, scale=[0,1]) translate([1,0,0]) square(1,true);
linear_extrude(height=3, scale=[0,1]) translate([-1,0,0]) square(1,true);
}
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