This Sensei's Divining Top Life Counter will be the center of attention at your next tournament.
Don't have a printer, don't worry. These are for sale here: https://www.etsy.com/shop/MrFoxClocks
New version with full filigree pattern here: https://www.etsy.com/listing/670690206/senseis-divining-top-with-filigree?ref=shop_home_active_1&pro=1&frs=1
See the updated version (with the same exact mechanism) in action here: https://bit.ly/2U0Qrlm
Just print one of each part and everything slides and snaps together, a bit of glue is required on the "top decoration" and "top cap". I have designed in tolerances so you should not need to do any post processing to make things fit.
It uses springs and air soft bb's to make the ratcheting mechanism super smooth with an addicting click sound.
Need 2 of each:
springs: 5mm diameter by 15mm uncompressed length
air soft bb: Flying Colors .12g 6mm BB (or any equivalent)