Where can I learn about 3D Printing?

After fielding questions from a number of students at the UMASS Entrepreneurship Club about where to find information on 3D Printing, I dug into my files and produced this list. It's a little dated, so some of the links might 404... but it'll get you started. Please email me any questions and comments, I'm always willing to help. https://docs.google.com/document/d/1a9-bA74IXh40F9n1K2enci3a2f0jiT9mAzSvJScCzfM/edit?usp=sharing