gsmith120, I have actually seen a demo. The students did an
interesting thing. They made the device out of plexiglass so you
could see what was going on inside. They actually make the image
from the bottom up. The interesting thing is the process. They
use a regular projector, like one you would project your PC
slides with. In fact, what they do is project a PowerPoint
presentation on material. The background is black. The part
image is what will be cured for that slice. Each slide
represents a very thin slice. So, part of their project was
going from the CAD drawing to the images for the slices. The
electronics in the device coordinate all this. It is a small
device (it was a student Project Lead the Way project). They
showed us basketball hoop (with backboard and pole) and a model
of the school as examples of what they had done. It was all very
interesting. Developments in materials have made a big
difference in driving forward the 3D trend, as we've covered at
DN: http://www.designnews.com/document.asp?doc