The Tidy Cats Breeze pellet litter boxes are great. What's not great is when you have an adorable cat that takes delight in playing with the pellets and kicking them out of the box.

The XL box has a too-generous entry door that makes it all too easy to eject the pellets. This “gate” gives the box a fightin' chance to keep the pellets contained.

Prints easy enough, flat side down. Recommend tree support for the little sticky-up thing. There is a very slight curvature to the outward face of the box that is not reflected in the model. Totally optional but you can put a slight bend in the finished print if you want to sit perfectly flush. You can do this with a heat-gun or just put the bend in by hand using the heated bed which is what I've done.