Free 3D Designs

Make Magazine - A resource for news about 3D printing, seeing what others are doing with their printers, and learning more about 3D printing overall.

Sculpteo - Free tutorials on converting designs from architectural and engineering software

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Thingiverse - A design community for discovering, making, and sharing 3D printable things. All designs are encouraged to be licensed under a Creative Commons license, so anyone can use or alter the design.

National Institute of Health 3D Model Exchange - Provides models in formats that are readily compatible with 3D printers, and offers a unique set of tools to create and share 3D-printable models related to biomedical science.
Access free designs by selecting "Public Domain" under License dropdown