Perhaps you need to read the World Economic Forum's "Top 10 emerging technologies of 2015 ". You can google it. At No.5 is: 'Additive Manufacturing ' which includes 3D printing.
In my personal opinion, 3DM is sat at the threshhold of a huge growth area for the 21st century - printing replacement human parts. That is why I am in 3DM. I work in the health service. I can see the future staring me in the face, with this company. It is a long term investment, not a DT dream, or even a short term trade.
All the above is my personal opinion. DYOR.
3DM Price at posting:
13.0¢ Sentiment: Buy Disclosure: Held