Hi all, The Ring'n'Roll arrived in Alumide. This model is made of two nested rings that have the shape of portions of spheres and that can roll freely one inside the other in any direction. It is probably way too big to make it an actual finger ring (too big even for a thumb ring) but it rolls very well and, as expected, it is really addictive Here are the pictures: In order to be sure it worked properly, I printed it in Alumide for cost reasons, but it is actually designed for Stainless Steel (2mm thickness and 0.75mm for clearance between the two rings). I will try to add a video as soon as possible. A version with holes (less expensive) is also available, but I did no tested it yet.