The scores of new cars on show at the North American International Auto Show come from factories across the US and around the world, but there's only one that comes right off the show floor.

Local Motors is pioneering a 3D-printing technology in collaboration with Oak Ridge National Laboratory that squeezes carbon-reinforced ABS plastic through an inkjet-like nozzle so, bit-by-bit, an entire car chassis can be created. The carbon fibre gives the plastic a lot more strength.

Once printed, the body is milled and polished so it's smooth and then it's ready for the wheels, electrics and steering and motor to be attached. Local Motors is sourcing those from the Renault Twizy, an electric-powered city car produced by the French automaker.

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