I was asked to print https://www.thingiverse.com/thing:2176304 but PrusaSlicer wouldn't correctly slice it. Instead I drew this in Fusion 360 based on the picture.

It printed nicely although maybe its a little small. Might be worth stretching in the X & Y directions.

The walls and floor are only 1mm thick. It's probably enough but the Fusion360 file is attached if you want to make anything thicker.