This is a sliding storage unit for Star Wars Destiny dice. The original design looked great for the Dice Masters size, but I've modified it to hold the larger SWD dice and allow for whole set storage (see photo for example).
The lid is a little wiggly yet inside the tracking. However, I put some generic masking tape down the rails to build up the thickness and it worked out great.
I originally printed the slider storage with less than 20%, however I would encourage more (if not 50%) because of the weight when all the dice are in the unit.