This is a set of ring sizers that can be kept on a large keychain or string. It features sizes 0-16 with the size on the edge. I wanted to achieve a simple and compact design while optimizing them for 3D printing.
I scaled them at a 1.021 to print them at the correct dimensions on my printer. Tested each size on my ring sizer for consistency. These are based of the inner diameter measurements in mm for US and Canada found here http://en.wikipedia.org/wiki/Ring_size.
I attached a full plate STL with sizes 0-16 including half sizes. I also attached a zip file with the individual STL files if you only needed to print a certain range.
UPDATE 5/31/2016: In the half sizes folder, I had incorrectly uploaded the 15.5 as the 7.5. It has been corrected, and you can print the 7.5 now!