Brick Trick: 3D-Printed Architectural 'Prosthetics' Show False Lego Innards:
3D printers are changing the world, for good and ill. Doctors can now 3D-print replacement bones perfectly customized to their patient's anatomy while terrorists could potentially print untraceable automatic weapons. In between these extremes are projects like 3D-printed graffiti by artist Greg Petchkovsky.
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