3D Design & Printing: Other 3D Design and 3D Print Resources

Biomedical 3D Printing Tutorials from embodi3D.com

The National Institutes of Health 3D Print Exchange

A constantly growing collection of 3D objects that may be viewed online or downloaded. Please see their About page for more details of their mission.

According to NASA 3D Resources site"Here you'll find a growing collection of 3D models, textures, and images from inside NASA. All of these resources are free to download and use."

Thingiverse Groups is a place to find find, join, and create groups around a wide variety of topics.

The main Reddit group for discussing all aspects 3D printing,