There are more free 3D models online than one can shake a stick at, but what about paid models? Hosting models somewhere and putting a buy button in front of the download is certainly a solved ...

The internet is full of stereolithography (STL) models that can be translated into a real-world form via a 3D printer. Some are free, and some you have to buy, and while many are fun to try ...

But before you run out to buy one, there are a few things you need ... If not, you'll find plenty of 3D model designs online, many of which are free to download. For example, at thingiverse.com ...