November 30, 2025
Spin it to win it—or is it SPAM?
Show HN: I engineered a 2mm micro-bearing D20 ring that free-spin for 20 seconds
Tiny dice ring spins 20s, sparks hygiene panic and “SPAM”
TLDR: An engineer built a 2mm-thick ring with a real micro-bearing that spins for ~20 seconds and works as a silent 20‑sided die. The community loved the precision but bickered over hygiene, spam vibes, and pricing, with jokes, a demo link, and a machinist YouTube detour fueling the buzz.
Hacker News lost its chill when a maker unveiled a 2mm-thick “dice ring” that actually spins for 20+ seconds thanks to a real micro-bearing. It’s jewelry that doubles as a silent D20 randomizer (a 20‑sided die used in tabletop games), and the crowd split fast: precision nerds cheering vs hygiene warriors gagging. The hottest question? How do you keep sweat, gunk, and “biojunk” out of a no‑lubricant bearing without turning it into a tiny finger compost heap. Meanwhile, one user smashed the “report” button by yelling SPAM, claiming repeat promos, while the maker dropped receipts with a demo video and design notes. The comic relief landed hard: a Price Is Right joke about the numbered ring face spun into “I’ll buy if the price is right,” and someone derailed the thread into a machinist YouTube rabbit hole that could keep you bingeing for a week. Under the drama, legit curiosity bubbled: can it be tougher, cleaner, and spin even longer without getting thicker? Some called it a grown‑up fidget spinner; others crowned it a wizard ring for stealth rolling. Either way, it’s the rare gadget that turned a tiny spin into a big argument—and lots of bookmarks.
Key Points
- •A 2mm-thick stainless steel ring integrates a true internal micro-bearing.
- •The ring uses 20 steel balls and spins freely for 20+ seconds with a single flick.
- •Inner race is CNC machined to ~0.01mm tolerance; balls load via a lateral channel.
- •Design avoids plastic, bushings, and lubricants; built for everyday wear forces.
- •PVD variant for color durability; outer surface can be marked 1–20 to act as a silent randomizer.