Free 3D CAD models from a community of mechanical engineers.

http://grabcad.com/

In-depth resources of 3D printing.

http://www.3ders.org/

3D Printing News tracks developments in the world of 3D Printing, Additive Manufacturing and Rapid Prototyping.

http://www.3dprintingnews.co.uk/

TCT is now the only communication portfolio that covers AM and Industrial 3D Printing in print, online and in person — globally.

http://www.tctmagazine.com/