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California just passed a law forcing mandatory DRM in 3D printers
(www.theregister.com)
This is a most excellent place for technology news and articles.
What you don't understand is that this is only about guns on the surface. This will enable every 3d printer manufacturer to harvest tons of data from everyone. To a point where the printer can not work without a connection to the server for security reasons by law.
You could buy a metal pipe and fill it with gun powder and you have a cheaper and more robust gun than a 3d printer could ever build.