This is a hit point tracker for tabletop games. It comes in 2-, 3-, and 4-digit sizes (edit: 4 April 2022, added a 6-digit size), as well as a 2x2 digit size with a spacer in between.

Print two end caps, the right core size, and the right number of dials (plus a spacer for the 2x2). A bit of glue is necessary to connect the end caps – be careful not to use too much, or squeeze out will ruin your build.

Great for Dungeons and Dragons hit points, Magic: The Gathering life points, or anything else you need to count.

Want something for tracking spell slots? Try my Spell Slot Tracker, which uses a similar mechanism.