A simple coaster holder I made to hold Star Trek coasters, but can be used for any round item about 88mm in diameter.  The coasters I printed were about 4.25mm thick and it can hold 8 of them.  The step file has no text, so you can add anything you would like.

These are the coasters that I printed

https://www.printables.com/model/397290-star-trek-coaster