Made specifically for https://www.printables.com/model/254328-sea-shell-dice-tower but can be used for another tower, or added to a base that needs a small catching material, as necessary.
Does move a bit on each roll, but this takes the least amount of filament to do the job. I thought about having the side walls be slanted but I had a few test rolls look like they would fall out, so I didn't do that.

I also have added the general wall I used to make it here as I just made a basic rectangle in blender and then adjusted it in prusaslicer for purpose - If you need a rectangle model to move around, there you go. :)