3D printing
I've never really had a big interest in 3D printing ornaments that sit on a shelf collecting dust; I use my 3D printer as a functional tool to make useful things.
The majority of my 3D printing these days is making box inserts for board games, so that the components are nicely organised in the box and it's easy to set up the game. I design a lot of them myself, and I post the STLs for free under CC-BY-SA on Printables.
I've also designed and printed a few different earrings, which I used to sell on Etsy. I'm not currently using my Etsy store, but I am considering putting the earrings on my ko-fi store instead.