I bought a 3D printer on a whim in the summer of 2016 and I never regretted it. Of the many 3D models I made since then, I share what isn't too specific for my particular situation, because I believe nobody should repeatedly solve problems that have already been solved by others.
I used to upload to Thingiverse but not anymore, because whoever maintains it no longer seems to care about it. Instead, my models are now on GitHub and the most popular ones also on Printables. See
https://www.dr-lex.be/3d-printing/ for an overview of all my GitHub models, as well as some articles about 3D printing.