Comment: Update 2:

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Update 2:

...So in due time, even as these open source DiY at home 3D printers are making headway, in the not too distant future it's only matter of time before MiM (Metal Injection Molding) process is transformed into 3D 'MiM printing' as well. The format is the same as the current plastic feed, but will simply be able to '3D print' in metal, instead of plastics.

** Um, scratch the "in the not too distant future," because apparently, 3D metal printers are ALREADY HERE!

Hell, soon you may even be able to "print" your own house in CONCRETE!!!

Or, not quite 3D 'printing,' how about 3D 'inflate & spray?'

Behold, "Concrete Carpet" that with any shaped under-mold, a flexible sheet of concrete, once sprayed with water (any water, including sea water!) will dry in 1~24hr into any shape you can imagine!

Predictions in due Time...
http://www.youtube.com/watch?v=zGDisyWkIBM

"Let it not be said that no one cared, that no one objected once it's realized that our liberties and wealth are in jeopardy." - Dr. Ronald Ernest Paul