I made this slightly bigger case than others to suit these bigger Gonggi:
https://www.printables.com/model/1149163-squid-game-gonggi-exactly-like-in-the-series
They are easy to remove due to small cutouts, and the lid secures tightly. No supports needed. Multicolour, all one file, there is a small gap around the letters to allow the slicer to detect the different areas for filament painting.
The author marked this model as their own original creation.