A generic box for holding PCBs with the following characteristics:
- 100 mm x 100 mm size (max size to qualify for JLC PCBs special price)
- 5 mm corner radius
- M3 mounting holes 5 mm from each corner
The screw holes in this box are not threaded but they are slightly smaller than required for a M3 screw and as long as you don't 3D print in a ridiculously tough material, it should be easy to drive a screw into the material (essentially cutting it's own threads). I tested this with JLC's 9000R resin and it worked well. I recommend pushing a screw driver into each mounting hole and twisting it a bit (to create a small dent with rough edges for the screw to get purchase onto) before trying to drive a screw into it.
Note: PCB.dxf was exported from PCB design software. PCB.scad was used to produce PCB.stl, which was then used as a reference in BoardBox.blend.
Photo of this box with my video Cable Breakout sitting on top.