You can always minkowski around an infinitesimally thin cylinder to make a disc. Applying minkowski with a sphere will produce the rounded disc you describe. If you subtract a cylinder of smaller radius from the disc to make a thin ring before applying minkowski then you'll get a toroid. Minkowski is very computationally expensive so you'll probably soon find it too slow for it to be useful in more complex models - there are often quicker ways of achieving a similar result. -- View this message in context: http://forum.openscad.org/minkowski-tp12862p12863.html Sent from the OpenSCAD mailing list archive at Nabble.com.