The age of 3-D printing in carbon fiber has hardly arrived. But the controversy over 3-D printing carbon fiber guns is well under way. Starting in the second half of last year, 3-D printing startup MarkForged has been shipping the Mark One, a device it advertises as the world’s first 3-D printer that prints carbon fiber; The Mark One digitally fabricateS objects in a material as light as plastic and as strong by some measures as aluminum. But one group isn’t about to receive its Mark One order: Defense Distributed, the non-profit political group that invented the first fully 3-D printed gun nearly two years ago. MORE
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