These are tile holders for Azul. They are used to organize the board while playing the game.The accessories for Pandemic: The Cure served as the conceptual idea for this.
For nine Factory rings, you'll get a perfect angle between the rings. For five, and seven, you'll not get perfect angles. But, it looks good enough.
I added a file with extra rings to be glued on top of the factory rings, should you want to have higher walls.
The holders have no bottoms. If you feel the need for those, glue thick paper to the bottom of the holders.
Should you want a 3D printer version, you'll find it here.