I wanted a dice tray and storage solution that I didn't have to worry about the lid for.

I copied a little bit of the structure from a different model and changed it into a tray for the ten 12mm dice. The lid is only a few layers thick so that it can flex appropriately.

Edit: Added Blank and Nocut lids. Still working on a Final insert design but hit a few snags when up sizing the box.

Edit: Added another version with a deeper slot for cards and reduced the angle. They were falling out too easily.