Much of the precision machinery, computer-controlled machines that can machine anything you want, are already there.

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Today dies are designed on a computer screen, and the data are transferred to computer-controlled machines, which cut the dies automatically.

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Weinberg points out that even before consumer 3D-printing became fashionable, gun enthusiasts were already making their own metal firearm components with computer controlled milling machines and posting their designs to sites like CNCguns.com.

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