Using VRML or STL files as source data, the machine “prints” cross-sections of your model on a bed of plaster dust, using a sugar-water binding agent instead of ink. First, the machine spreads a thin layer of plaster, 0.004 inches thick on top of a large piston. Next, four inkjet printheads deposit the binding agent, either clear, or yellow, magenta, or cyan. Wherever the binding agent touches the plaster, the dust hardens, creating a solid cross-section of the digital model. The printer continues adding and hardening layers of dust until the model is complete.

The model is then excavated from its bed of plaster dust and gently air-cleaned. Please see the following videos to see our 3D Printer in action. The first shows the z510 laying down successive layers of plaster and binder, working towards building four of our promotional coins. The second video shows the coins after they have been removed from the machine and most of the excess powder has been brushed off. The air compressor removes the last of the powder dust.

Via: ualberta.ca