This piece is used in conjunction with a pre-bought litterbox for a weatherproof option. Great for catios and balconies.

I recommend using a more robust filament than PLA so that it lasts despite sun and rain.

This can be attached to the top of a dome litterbox like:
https://www.amazon.com/gp/product/B0002DH8L4/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&th=1

where the base piece goes under the handle and then the cover is glued into the holes. I kept some space between the cover and litterbox so that there is still airflow.