As you may know, one of the things I like to do are field recordings and sampling of unusual potential instruments. While it’s true that the standard plastic fidget spinners don’t make a whole lot of interesting sounds (unless you like slightly clattering plastic), metal fidget spinners can spin fast enough to create some interesting wind/propeller effects, along with interesting metal ringing sounds as the spinning metal part tends to resonate at a certain frequency (this is especially true of stainless steel ones, which create an effect not entirely unlike a tuning fork or a singing bowl). Also the metal ones provide enough inertia that they can produce interesting audio with a loose or dirty bearing, allowing for some interesting mechanical grinding and wobbling timbres.
I’m considering doing another free sample pack using some metal spinners that I’ve come across here and there (recorded with my field recorder, so probably not studio quality, but useful to do things with in experimental music nonetheless). In the meantime, though, here’s a track that’s basically recordings of a few different metal spinners, processed through some glitch and granular effects to create an interesting little sonic noise-scape: