3D printing is huge according to me, it can do things which were never thought before,

International Space Station which orbits the eat has a 3D printer, so when a part breaks or needs replacement, they simply ask for it to be designed on earth and then the part is printed using 3D printer. This makes it very cost effective.

Previously, if a part broke down, then the part used to be sent from earth along with the supplies, which meant there was a waiting time involved.