You might already know all of these sites,

3D Printing
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You might already know all of these sites, but I decided to help you out in case you are new to 3D printing. Enjoy!

Originally shared by 3devo

Top 7 Sites To Download Free 3D Printing STL Models. Sometimes you don’t always have the time to create your own 3D models, so here are some sites featuring free STL models to help you out, enjoy! http://ow.ly/Q832a

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Forgot NASA.gov. Very few models, but high quality, and the cool-factor is through the roof!
http://nasa3d.arc.nasa.gov/models

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@Carlton_Dodd thanks man! Guessing you’re a space enthusiast too? This site looks amazing.

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@Marco_Agas
We launched a spacecraft 9 years ago, it traveled millions of miles, and we threaded it between Pluto and its moon. Yeah, space travel is pretty cool!