Petri dish dispensers

Design allows for easy refills.

The hole in the back was added for an easier dispensing experience. 

If you work with 35 mm petri dishes, it's likely that they have lips that help them stack on top of each other. These lips may sometimes cause dispensing issues. In those cases, use the hole in the back to push them out easily.

The capacity of each model is as follow:

35 mm: 20 dishes
60 mm: 16 dishes
90 or 100 mm: 16 dishes

The same model can be used for 90 and 100 mm petri dishes.

Supports are needed for the bottom part of the sleeve. The slits in the sleeve can be printed without supports.

For another variant of the 60 mm dish holder, check this design: https://www.printables.com/model/994965-petri-dish-dispensing-station-60-mm