Parameterizable modular resistor box with bump

This is BOX.stl from [Parameterizable modular resistor box](https://www.thingiverse.com/thing:3027083), modified with a little bump in the upper-rear so the trays don't fall out.

I also tightened the tracks to a tolerance of 0.1mm, because if your drawers are falling out then your tracks are loose too. A modern software stack (e.g. Arachne engine & Pressure advance) should hit these numbers better than printers of yore.

Note that "up" is the side with two tracks, according to the CAD model. If you orient it upside down, the bump will wedge against the bottom of the tray instead of riding over the lip.

I combined this model with DRAWER_new.stl, but it looks like the other drawers should be compatible.

Recommended PrusaSlicer settings:
- Orient with the rear window on the print bed
- No support
- 1 wall (reduces filament usage)
- 10% Gyroid infill (reduces filament usage)
- Avoid crossing perimeters (keeps the paper slot clear)