I wanted a protective case for a small USB-C portable SSD I have that has a tendency to get knocked off the table, so I opened FreeCAD and designed one to fit. (It also makes it easier to grip.) It's a simple enough design, and I made it as parametric as I could in case I decide to replicate it for other devices. 

I'm including the FreeCAD file in case someone has a similar need. You can adjust the values in the Spreadsheet to fit your device, although changing some of the values may break some of the fillets.

This was printed on my Anycubic Kobra Go using some generic blue TPU.