What do you mean? That the exported stl cannot reimport into openscad again? Openscad only uses CGAL to make the STL, so if result is not compatible with input mesh of CGAL, it's an error in the CGAL which is coded by geometry professors. I haven't had any stl that aren't fixed in netfabb, did you press the red + button? Don't know if the netfabb fixed CGAL result can be fed back into CGAL, you can also try meshmixer for boolean ops if you want to add smaller numbers of objects. Openscads biggest strength is making printable STL using 1000ds of combined building blocks in super complex arrangements, perhaps the STL export re-import is just a weakness of CGAL engine. -- View this message in context: http://forum.openscad.org/openscad-stl-almost-unusable-tp14472p14560.html Sent from the OpenSCAD mailing list archive at Nabble.com.