Where to find 3d models
Great variety of custom models for different tools / car parts / bicycle part / etc. Users do adjustments (remixes) to already existing models, that are grouped under the same model and can be easily checked, if there's any suitable one for a special case.
An official store of Prusa 3d printers, has a big variety of different models available.
A marketplace sort of a website, that allows to buy/sell the models, but also has a wide range of good quality 3d models free to use or distribute.
Cults3d is more or like a shop for models, as most of the models are pay to download, however, there are still some good free models out there.
An official store of Bambulab printers, wide variety of models as well, has also an interesting loyalty system for sharing/supporting models of other users, that give you bonuses equivalent to real money, that can be used to purchase filaments or even printers.

