Threeding.com
A 3D printing marketplace and file sharing website where 3D models suitable for 3D printing can be bought, sold or exchanged.
3Dupndown.com
3Dupndown allows people around the world to discover, observe, upload, download, and share originally created 3D models. Members can interact, inform, and inspire others across the globe. In short, 3Dupndown acts as a distribution platform for 3D model users, creators, and advertisers.
Pinshape.com
small team of people excited about 3D printing! We’re creators with a passion for 3D design, collaborative communities and fantastic ideas. We started Pinshape as a way to bring these three interests together in one amazing 3D printing platform.
Thingiverse.com
MakerBot's Thingiverse is a thriving design community for discovering, making, and sharing 3D printable things. As the world's largest 3D printing community, we believe that everyone should be encouraged to create and remix 3D things, no matter their technical expertise or previous experience. In the spirit of maintaining an open platform, all designs are encouraged to be licensed under a Creative Commons license, meaning that anyone can use or alter any design.