Making fingerboards. Little skateboards you can do tricks with. I'm always fingerboarding at work when I take a break from programming.
It's a ton of fun, especially writing Fusion 360 scripts to do all the parametric modeling of decks and molds. Then 3D printing molds with different parameters, pressing decks with veneer, making art for the decks, packaging, etc. It's an incredibly niche hobby but I've always found fingerboarding and making fingerboards to be infinitely creative.
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