Additive Manufacturing LinkedIn Groups

Group URL
3D Printing https://www.linkedin.com/groups/792077
3D Printing Guild https://www.linkedin.com/groups/2436623
Additive Manufacturing (AM) – Rapid Prototyping ( RP ), Tooling and Manufacturing -3D Printing https://www.linkedin.com/groups/2861019
From 3D Printing at Home to Additive Manufacturing https://www.linkedin.com/groups/3953970
3D Printing Entrepreneurs https://www.linkedin.com/groups/4752051
ACG – 3D Imaging, 3D Printing, Rapid Prototyping & Additive Manufacturing Users https://www.linkedin.com/groups/88762
TCT + Personalize – 3D Printing & Additive Manufacturing Network https://www.linkedin.com/groups/48133
3D Printing for Architects https://www.linkedin.com/groups/1073657
Medical Additive Manufacturing & 3D Printing https://www.linkedin.com/groups/4291145
Additive Manufacturing Users Group (AMUG) https://www.linkedin.com/groups/4489581
3D Printing And Designs https://www.linkedin.com/groups/7464612
Metal Additive Manufacturing https://www.linkedin.com/groups/8136138
Shapeways 3D Printing Community https://www.linkedin.com/groups/3798480
3D Printing / Additive Manufacturing Jobs and Recruitment Network https://www.linkedin.com/groups/8158492
3D Modelling 3D Printing 3D animation https://www.linkedin.com/groups/3730545
Consumer 3D printing https://www.linkedin.com/groups/4311452
Additive Manufacturing in Defense & Aerospace (AMDA) https://www.linkedin.com/groups/8243860
Medical 3D Printing https://www.linkedin.com/groups/4845011
3D Printing & Rapid Prototyping https://www.linkedin.com/groups/4370917
3D & 4D PRINTING MATERIALS SOCIETY https://www.linkedin.com/groups/4407899
America Makes – The National Additive Manufacturing Innovation Institute https://www.linkedin.com/groups/4669084
3D Printing – What Lies Ahead. https://www.linkedin.com/groups/5084313
3D technologies (scanning, editing, modeling, printing, prototyping) https://www.linkedin.com/groups/3923713
Aerospace 3D Additive Manufacturing https://www.linkedin.com/groups/4980198
3D Printing; Digitize, Democratize, Disrupt https://www.linkedin.com/groups/6960673
3D Printing News and Discussions https://www.linkedin.com/groups/5051429

Other useful links:

Name Tool Coverage
AM Motion (www.am-motion.com) EC funded project on AM Mapping Worldwide
AM Platform (www.rm-platform.com) EC funded project on AM Mapping Worldwide
3DP Business Media (www.3dpbm.com) AM Business directory Worldwide