I started up Reddits functional print many years ago to serve as a gallery/showcase to inspire others that 3D printing has a lot of useful uses.

I left Reddit with the Exodus, but I believe it still exists, although it's probably bot filled garbage now.

But it had a huge list of useful things.

I have a similar thead here on the fediverse, but the original site (kbin.social) died out and I haven't bothered to get another going.