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I am afraid I don't know the answer to this. I don't know what version I developed under but when I tried your parameters in "2015.03-2" (the system package on debian jessie) I get a different problem that the one you describe -- ERROR: CGAL error in CGALUtils::applyBinaryOperator union: CGAL ERROR: assertion violation! Expr: itl != it->second.end() File: /usr/include/CGAL/Nef_3/SNC_external_structure.h Line: 1149 and the thread is missing altogether. :-/ Here, using shaft_ht=24 gives a good result when rendered and exported. I'm trying to attach this "long" screw to this reply, let's see if that works.