In this photo taken Wednesday, May 15, 2013 Peter Weijmarshausen, the co-founder and CEO of Shaepways, speaks about the many items that can be made with 3D printing during the Hardware Innovation ... more 
In this photo taken Wednesday, May 15, 2013 Peter Weijmarshausen, the co-founder and CEO of Shaepways, speaks about the many items that can be made with 3D printing during the Hardware Innovation Workshop in San Mateo, Calif. With the printers users make whatever they like, iPad stands, guitars, jewelry, someone even made a rifle. About the size of a microwave oven, the printers usually extrude plastic, layer upon layer, to create objects. Sales are projected to jump from about $1.7 billion in 2011 to $3.7 billion in 2015. (AP Photo/Eric Risberg) less 
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Associated Press | Photo By Eric Risberg
Sun, Jun 2, 2013 3:33 PM EDT