LibGuides: 3D Printing and Scanning: Free 3D models

3D model repositories

You can search for pre-existing models on the Internet to print as they are, or to modify using 3D modelling software.

AfricanFossils.org
Africanfossils.org has several 3D models of significant fossils and artifacts in categories such as hominids, animals, and tools. It is a partnership with Autodesk, National Geographic, the Turkana Basin Institute, the National Museum of Kenya, and Stony Brook University.
Thingiverse
Thingiverse is a community to discover, make, and share 3D models. Users can download files of objects that others have made. Several of the objects can be customized and modified.
NASA 3D resources (Beta)
NASA's 3D resources site that includes several printable models in .STL format.
My Mini Factory
Downloadable 3D models designed for 3D printing, for free.
Smithsonian X3D
Collection of 3D models of various artefacts from the Smithsonian Museums.
Grab CAD
Free CAD models from more than 1 million engineers.
Shapeways
Make, buy, and sell 3D printed products.
SketchUp 3D Warehouse SketchUp's design library of 3D models.
SketchUp 3D Warehouse
SketchUp's design library of 3D models.