They can already print guns with these
tools--the Syrian insurgents could use a few. The legal obstacles are
significant, though probably hard to enforce, as with other forms of digital
piracy. Also, the right materials to produce goods remain necessary and can be a
major part of the cost. Environmentally, over-enthusiastic home manufacturers
could be a problem.
The last bit about the "replicating rapid prototyper" has particular
potential.
The nanotech promoters have been
speculating for decades (starting with Feynman back in 59') about nanomachines
that can create new molecules and chemicals and replicate themselves as well.
This concept is much further off from realization, however, and progress has
been extremely slow except for systems using biological molecules like DNA.
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