A pokemon style gb cartridge i made for myself. It does not fit on at least some gameboy color games due to some parts in the way but that could be cut out on the 3d model.  I had to print it without supports or anything just as it is but that might just be my printer.. 

GBcartridgefrontplate.3mf

I made a simple case for my led buddy. bottom part is a little cramped but it works well for me. 
simple design and pretty fast printing. 

Led Buddy Case

LedBudTop.stl

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IanAlmighty

GBcartridgefrontplate.3mf

Led Buddy Case