For those of you who are interested in small(very small) scale models...
The new device prints layers of a liquid resin, developed at the Vienna University of Technology, that hardens to a solid when it's hit with two photons from the printer's laser beam. Continuously-moving mirrors focus the beam to the right place as the printer works. The results have a resolution of hundreds of nanometers, which means each of the sculptures the printer makes is about the size of a grain of sand.
The whole article by NBC is at this link:
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