-What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?

Couple of things actually. I've seen a news where a group of people managed to print a structure made from concrete. Another one is printing body parts. Very helpful for people with heart problems and who suffered major burns.

-If you could build your dream 3D printer, what would it include and what would it do? Let your imagination run wild!

My dream 3d printer should be able to print using metal. I know a cnc mill would do but i just want to see that happen in a smaller scale.