On Oct 14, 2012, at 9:03 PM, Igor Chudov <ichu...@gmail.com> wrote:

> The article is mostly balderdash, but it mentions making gun receivers with
> 3D printers. This confused me somewhat, since I thought that 3D printers
> can only make plastic objects.

The 3d printers that are now cheaply available to hobbyists do print using 
plastic. However, there are high-end machines that print using metals. There 
are a number of processes.

Example:
http://production3dprinters.com/slm/direct-metal-slm

-Pete
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