It is not clear to me what is your intention: Would it be to fill the gap between the union and the xy plane? To make a stand for the objects you would need something like a negative mould of them. Is that your intent? -- View this message in context: http://forum.openscad.org/Hulling-a-projection-tp21748p21752.html Sent from the OpenSCAD mailing list archive at Nabble.com.