https://www.tinkercad.com/things/13s3ZXA3rvU - please feel free to mess around with these files.

This combined a few different versions into one final version that worked. many small tweaks were made to accommodate easy support removal, proper fit, structural integrity, resizability, and more.

There are two "inner tube" files. Either will work printing at full scale. I did print one at 35% scale for my opponent's life total, and needed the thicker version, as the walls were too thin on the original version.

I got this PLA set for the print:
https://www.amazon.com/gp/product/B07JMRNHVS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I did accidentally print my middle piece in the wrong color.

Note, the inner tube should be super glued to the bottom piece for it to work best. The top should not be glued so you can store your dice.