3DprintBoard, www.3dprintboard.com, is one of the largest 3D printing forums on the web. The members of this forum discuss all things related to 3D printing, including 3D printers, 3D design, 3D scanning and more. At the time of this entry, May, 23, 2014, there were 2,803 members and nearly 16,000 posts.
There is also an area of the forum where companies and individuals can promote their 3D printing businesses. People and businesses looking for 3D printing services can post in this area as well.