I saw a picture online that someone figured out that they could fit 10 Switch games in an original Gameboy game case. The concept was great, but I really didn’t want my games shaking all over the place. So my trays only hold 8 games in a case, but I am happy with the results, and little bit of nostalgia of storing my new games in cases that held some of my earliest.
Print two of the trays, load them up with your favorite games and place them in an empty gameboy game case. Printing should be fairly easy without any need for supports. Print resolution is not super critical, I did mine at 0.2mm.