I used the original OpenSCAD file (https://makerworld.com/models/478570) to design a case with similar dimensions to another slim case (https://makerworld.com/en/models/602408), but with enhanced protection features. I borrowed the camera protection component from that slim case as well. It functions excellently with PLA and PETG, as well as most other non-flexible filament materials.

Note that the case fits snugly. I found it easiest to put the camera protector on first, then slide the bottom 2 corners of the case in (near the charge port), followed by the top corner opposite the buttons. It should fit in place easily.