Keeps the kitties from pulling apart the carbon filter in a Catit litter box. Fits flush with the opening to keep a stock look.

This project was inspired by devsfan1830's https://www.thingiverse.com/thing:3007982 which is permanent and I think a little bulky looking. I wanted the functionality of that project, but fitted to the shape of the filter opening and with a less industrial gridwork. I think it would look better with a lattice of swirls or paisley shapes, but this was a quick job.