I happened to be watching an episode of Talk About Games, from the YouTube Channel Cinemassacre, and they mentioned the desire for a stackable and connecting Gameboy cartridge case.
Of course I rushed to Sketchup and made a quick doodle, followed up with the case on the printer now being printed.
This is currently still very beta, and I have yet to test fit a game, or the case together… I will be updating it once I verify fitment, and I plan to drastically change the interconnection method.
Though you can find it on Thingiverse at