This design is loosely based on the "Frantic Playing Card Box" by noscoars (https://www.thingiverse.com/thing:3783503). Since his design doesn't account for the Pandora's Box AddOn, I designed a box that replaces the original cardboard box entirely.

The box can be colour-coded to make it easier to sort the cards back in (as I did). The space for the yellow cards (from the supercharge add-on) also has space for the small rulebook since it is not very well described in the larger rulebook.
To assemble you will need an 184x4mm rod, which you can print or use a metal rod like I did. Also, there is room for a total of four 6x3mm magnets to be inserted (two in the box and two in the lid).