NASA

US Government agencies such as NASA, The Smithsonian, and the NIH have started to create their own collections of 3D objects!

NASA's model collection is mostly contains models of their satellites however it also contains some of things like space suites, shuttles, and a martian crater. Unfortunately, most of these models are not printable. NASA has conveniently separated the printable models on this page.

The Smithsonian museum has also started uploading 3D models of items from their collection to their Smithonian X3D website. Though many of these models look amazing many also look unprintable so be warned before you try to print them.

The NIH has taken a different approach to 3D model collection by making a Thingiverse like website for medically accurate 3D models. As you might expect, many of these 3D models of proteins and cells are scientifically accurate but likely un-printable. (Especially on our classroom 3D printers.)

NIH

UPDATE 7/4/15:  There are more model repositories that have been brought to our attention.  Here is a running list:

• HHMI Biointeractives (small, but hopefully growing) 

-Abe (entering 8th grade)