My Customized ring sizer.

thingiverse

This custom-made item is based on the design found at http://www.thingiverse.com/thing:312419. It was created using the Customizer tool available at http://www.thingiverse.com/apps/customizer/run?thing_id=312419. For this specific version, the ring size increases by 2 at each level, with a thickness of 2. There are seven rings in total, starting with a first ring size of 4, and each ring has a width of 8.