This spinning ring is anything but a simple, every day ring. Sizing with 3D printers can always be problematic and that was the first challenge of this ring's design. After finding out the right dimensions to get a good press-fit on the roller bearing, the chosen ring design was split in half. The first part fits inside the bearing to press against the rollers and to go over the ring finger, and the second half goes around the outside of the roller bearing to make the outside of the ring.
