Hi, I mean that the _2D_ object touches the Y axis in one vertex. If you move the 2D object a tiny bit in the positive X direction, it should work. -Marius -- View this message in context: http://forum.openscad.org/Assertion-Violation-in-Render-tp10598p10607.html Sent from the OpenSCAD mailing list archive at Nabble.com.