This set of custom inserts for the argentum verlag edition of Hansa Teutonica replace the stock cardboard insert with a custom tray that's only 12mm high. This allows you to keep all of your expansion boards in the original box with all the pieces and player mats.

As a bonus, the trays for player pieces are removable, and can be used as the stock/supply during play.

The big tray is split into two sections that dovetail together to fit on a Prusa i3 print bed.

If you'd like to tweak the model, the original OnShape document is available here.