A 2mm micro-bearing ring that spins like a real fidget spinner
My motivation was pretty simple: every “spinning ring” I tried felt a bit fake. They don’t actually spin — not like a real bearing. So I wanted to see if I could make one that truly does. At the end of the day it’s still just a ring. A small, minimal piece of jewelry. But it happens to hide a tiny bearing that can hit around 800 RPM with a single flick. That contrast is what makes it fun. The way I think about it is this: it’s like a normal-looking car that quietly turns out to fly. Nothing loud or showy — until you decide to reveal what it can actually do. If you’ve used a good fidget…
What it does
In the maker’s words, at launch
My motivation was pretty simple: every “spinning ring” I tried felt a bit fake. They don’t actually spin — not like a real bearing. So I wanted to see if I could make one that truly does. At the end of the day it’s still just a ring. A small, minimal piece of jewelry. But it happens to hide a tiny bearing that can hit around 800 RPM with a single flick. That contrast is what makes it fun. The way I think about it is this: it’s like a normal-looking car that quietly turns out to fly. Nothing loud or showy — until you decide to reveal what it can actually do. If you’ve used a good fidget spinner for focus or stress, the feeling is similar. This is basically that experience compressed into a silent, smooth, 2mm-thick ring you can wear without thinking about it. The D20 idea grew out of that. It’s not the main point — just a side effect of the spin being clean and consistent. The reactions have been funny. As a ring, some people say it’s “too plain.” As a fidget spinner, it’s “not extreme enough.” As a D20, it’s “not official enough.” That’s what happens when something lands between categories. To me it’s simply a pared-down version of all three. If I wanted something louder, flashier, or more decorative, that’s easy to explore later. This first version is about getting the core idea right: a real, precise spin inside a clean 2mm ring. Once that foundation works, the rest — styling, variants, whatever comes next — is straightforward. Hope that gives a clearer sense of what I was trying to do. Demo video (just the mechanism in motion): https://vimeo.com/1139679503 More Info: https://spinity.co/
Does the same job
all alternatives →- IEI engineered a 2mm micro-bearing D20 ring that free-spin for 20 secondsNov 2025 · ▲23
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 see online cheat by simulating rotation — there’s no real bearing, just loose tolerance metal sliding on metal. True micro-bearing rotation needs precision, tight tolerances, and high surface finish, which is difficult when everything needs to be wearable on a finger. So I tried to…
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The little particles will gravitate to your cursor (or touch location), and can even enter stable orbits if the conditions are right! Mainly an excuse for me to experiment with wasm and WebGL, but it makes for a surprisingly good fidget toy.
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Community, All the HN belong to you. This is an archive of hacker news that fits in your browser. When I made HN Made of Primes I realized I could probably do this offline sqlite/wasm thing with the whole GBs of archive. The whole dataset. So I tried it, and this is it. Have Hacker News on your device. Go to this repo (https://github.com/DOSAYGO-STUDIO/HackerBook): you can download it. Big Query -> ETL -> npx serve docs - that's it. 20 years of HN arguments and beauty, can be yours forever. So they'll never die. Ever. It's the unkillable static archive of HN and it's…
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