This is a Nintendo Switch gamecard holder I designed to use my metal Smash bros game box (however it fits on any game box!). The idea is the original game boxes are not very useful, they are quite big and they only store 1 cartridge! They do not even have a little book with the game manual! Printing this up to 10 game cards may be stored in one original game box.
PLA works fine, 0.2mm layer and 40% infill in my case. Use the little flaps (those flaps used to hold the manual) to fix the piece in your box.