Quarto game with a travel box and optional support for magnets to hold the pieces in place.
Print 2 sets of pieces with 2 different colors.

If you opt for using magnets, they should be 6x3mm, you'll need 32 of them. Make sure you insert them all with the same polarity facing upwards (for the box bottom) and downwards (for the pieces).

Optionally you can print the letters and glue them on the top of the box.

Edit 16/01/24: Added a hollow top which uses less material. Will work best with magnets to hold the pieces in place while moving the box.