BBC : It sounds like the stuff of science fiction - machines that can "print" solid objects - but 3D printing isn't really printing at all, at least not in the traditional sense.
It is the process of making three dimensional solid objects from a digital file. Successive layers of material are formed under computer control to create objects ranging from plastic bottles to aircraft parts and prosthetic limbs.
A 3D printer is essentially a type of industrial robot.
It's a growing market worth an estimated $5.2bn (£3.4bn) this year, according to market analysts canalys.
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