An Keyforge insert for the box of the Mass Mutation starter set. I used the german version, but it should be the same in other languages.

The box has 4 deck slots and 5 slots for the different tokens, as well as a cutout to lift the decks out of the box.

The dimensions (195x195x42) were taken from Zilith's design: https://www.thingiverse.com/thing:3698009