I engineered a 2mm micro-bearing D20 ring that free-spin for 20 seconds

In plain words

This is a wearable stainless steel ring featuring a genuine 2mm-thick micro-bearing mechanism with 20 steel balls that spin freely for over 20 seconds. Unlike typical spinner rings that rely on loose metal-on-metal contact, this design uses precision CNC machining with 0.01mm tolerances and a proper bearing track to achieve smooth, durable rotation. Made for anyone interested in mechanical fidgets or precision engineering, it stands out for using actual bearing technology in a functional finger ring.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

Over the past few months I’ve been experimenting with how small a functional bearing-based mechanism can get while still feeling smooth, durable, and useful. This project started from a simple question: How thin can a real, free-spinning bearing be while still handling continuous rotation? Most “spinner rings” you…

• A2
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