This is a shallow box for speaker wiring. I needed a shallow surface
mounted box for speaker connectors in a camper. The connectors
were designed to install in a flush mounted electrical box. I made two
versions, the first has solid sides, but to reduce print time and reduce
plastic, I modified this and removed the sides and a section of the
back. I have included both design files and both stl files. The pictures show the modified version.

This was printed in PLA, 20% infill, 3 solid layers top and bottom and
3 layers vertical shell. It was printed at .3mm layer height with a brim.