The last two faces have the wrong vertex order - previewing with View >> Thrown Together shows this in purple - it renders when the faces are replaced with [6,2,0],[0,4,6] Nowadays the faces don't have to be triangles now so you could just define the 6 quadrilateral faces of the cube Chris -- View this message in context: http://forum.openscad.org/polyhedron-no-top-level-geometry-to-render-tp12310p12311.html Sent from the OpenSCAD mailing list archive at Nabble.com.