This is a 3 digit HP/Life counter for RPGs or whatever you like. It ranges from -99 to 899 which is a pretty wide range but it can be extended since you can add as many digits as you like (I've included the .123dx files so you can modify it easily). You only have to add more number rings and extend the pentagonal shafts. The tolerances are quite forgiving and there should be no problem in printing it.

For the assembly two elastic band are required (ora a single big one). They will keep the pieces together AND highlight the right line of numbers to read. (See next sections for details).