In this video Bill explains some of the engineering principles underlying the design of a DLP (digital light processing) 3D Printer. The printer featured is an Ember printer, manufactured originally by Autodesk, but now an open source project. Learn more about ember: http://ember.autodesk.com.
Support Bill's work by becoming an advanced viewer: http://www.engineerguy.com/support.
Videos linked to in at the end of the video:
Micromirrors
...
...
Ember Details
...
Overview of 3D Printing
...
Element 14 video:
...