SEGA Game Cartridge Sleeves
thingiverse
This is just a slight modification of the Sonic 2 Game Cartridge Sleeve by 'mathgrrl'. You can find this here: https://www.thingiverse.com/thing:203998 All I did was remove the text and logo, this is now a blank sleeve.
Download Model from thingiverse
With this file you will be able to print SEGA Game Cartridge Sleeves with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on SEGA Game Cartridge Sleeves.