问HN：有没有光滑的、可穿戴的旋转戒指（指尖陀螺）？
我一直在寻找一种能够顺畅旋转的可穿戴戒指，类似于小型的指尖陀螺——我想要的是具有真实旋转惯性的，而不仅仅是一个松松垮垮的装饰性环。<p>我到处搜索，只找到了：<p>带有摩擦外圈的“旋转戒指”<p>便宜的亚马逊版本，旋转部分会掉落<p>只能旋转几秒钟的设计<p>沉重或笨重的戒指，佩戴起来不舒服<p>我想要的是：<p>足够舒适，适合日常佩戴<p>能够轻轻一拨就顺畅旋转<p>摩擦力低（理想情况下像轴承一样光滑）<p>能够保持完整超过几天<p>不会发出咔嗒声或卡顿——只需顺畅旋转<p>像这样的设备真的存在吗？<br>还是说在戒指形态中存在某种机械限制，使得“指尖陀螺级别的光滑度”难以实现？<p>我希望能得到任何尝试过类似设计、了解应避免材料或理解制作微型可穿戴转子工程限制的人的见解。
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I’ve been trying to find a wearable ring that spins smoothly, similar to a small fidget spinner — something with real rotational inertia, not just a loose decorative band.<p>I’ve searched everywhere and only found:<p>“spinner rings” with friction-based outer bands<p>cheap Amazon versions where the rotating part falls off<p>designs that spin for only a few seconds<p>heavy or bulky rings that don’t feel wearable<p>What I’m looking for is something that:<p>is comfortable enough for daily wear<p>can spin cleanly with a flick<p>has low friction (ideally bearing-like smoothness)<p>stays intact longer than a few days<p>doesn’t click or ratchet — just smooth rotation<p>Does a device like this actually exist?
Or is there a mechanical limitation that makes “fidget-spinner-level smoothness” hard to achieve in a ring form factor?<p>I’d love insight from anyone who has tried similar designs, knows materials to avoid, or understands the engineering constraints of making a tiny wearable rotor.