They've been using those machines for a few years now to prototype products (they showed it on the Pitchmen show a while back). They have similar machines that can work from CAD drawings too, creating stuff that hasn't existed yet, not just copying existing things.
It won't put mechanical designers and prototype makers out of work, it just moves them from a machine shop to a computer. You still need the design and engineering skills. Computers are nothing more than dumb, inert machines until a skilled operator uses them.