There’s been a lot of buzz surrounding 3D printing, but what exactly is it asks AsapSCIENCE

3D printing works in the same way a computer printer prints an ultra thin layer of ink on a page to form text. Except a 3D printer can print multiple layers of plastics and even metals to form three dimensional objects. 

Generic mass produced objects may soon be a concept of the past. 

One dad even printed a prosthetic arm for his son. 

In the future, the 3D printer may very well be looked at as the first real replicator made famous from Star Trek. 

GE 3D printer blog