Simple Parametric Gameboy Cartridge Holder

Game Boy Cartridge Holder -- This is similar to a bunch of other gameboy cartridge holders I've seen here. I downloaded one (don't remember which one now) and my slicer wouldn't print the STL properly, so I decided to just make my own parametric version.

It's sized for PLA; if you use a different filament you'll want to print a thin slice from the top of a 1-cartridge holder to test the fit and adjust the cartridge_width and cartridge_depth variables as needed.