I looked into this a while back and gave up.
I didn’t find any (good) models I wouldn’t have to pay for, but some of the paid STL sites had sets available for really reasonable prices, so that wasn’t really a blocker.
But FDM is basically incapable of printing any interesting models. Even if you’re printing good layers, most interesting models aren’t geometrically compatible with how an FDM model prints. You can print with supports, but removing supports from such thin, fragile bits of a model is nigh impossible without doing damage.
I went as far as shopping around for a resin printer, but I didn’t like all the ventilation cautions I read. Adding a printer is one thing, but having a well ventilated area that overlaps with where I’d want a printer was an unsolveable problem in my home.
If you just want to give it a try, grab a model off Thingiverse and see how your printer does. If you can get a piece you’d be happy to proceed with painting, that might be worth a few more iterations to see if it’s workable for your setup.
You just gave me opinions I didn’t know I held.