Oura sizing ring case

The Oura sizing ring models can be hard to tell apart, and the tiny text labels on them don't print well. Here is a case to organize them.

There is no lid, the rings should fit with a bit of friction so they don't fall out. If not, either adjust your slicer tolerances or the OpenSCAD tolerances.

This case might fit the actual rings as well, but I don't have any yet.