Well, Star Trek-The Next Generation is getting closer to reality now. That show presented to us the concept of the Replicator. That that fictional device is a step closer to real world development.
A Replicator is a machine capable of creating (and recycling objects. Replicators were originally seen used to synthesize meals on demand, but later on in the tv series, they had other uses including industrial size replicator machines.
Use the link below to read the article entitled "3D printer could build moon bases" by Lin Edwards. Check out the other links also.
Wikipedia-Star Trek (http://en.wikipedia.org/wiki/Replicator_(Star_Trek)).
MSNBC. November 4, 2009 (http://www.msnbc.msn.com/id/33626447).