http://thelapine.ca/man-with-3-d-pri...s-3-d-printer/

There is no greater subject for 3D printing than the potential for exponential production.

Using mined extraterrestrial material for toner, we could theoretically set up an exponential production line, where initially one 3D printer and some mining equipment could produce toner that would be used to print more 3D printers and mining equipment. This isn't pie-in-the-sky, but realistic and almost mind-blowingly powerful.

In fact, you could launch a 3D printer and by the time it got to the extraterrestrial location the technology of what to print could have dramatically improved, transmitted digitally to the production line from the home base.

http://coldfusionnow.org/exponential...d-3d-printing/

Here is another explanation, using LENT, another emerging technology.