This is an additional drive bit storage rack for the case that comes with Ryobi driving bit sets. The case is modular and some sets can fit more bits than they come with if you print another of these and shuffle the existing ones around. This model closely replicates the originals.

Print with support for the pressure tabs at the back of the bottom row of slots. The supports can be popped out with a very small screwdriver from the top, or just left in. Popping them out appears to make the fit a little tighter, so you can try that if certain slots are a bit loose.