Here is a cheap volumetirc 3d display you can make with your 3d printer and Dremel tool. It still needs some development, but I think most of the parts could be 3d printed. Cheep 3d projection device. Very cool!
Via Hackaday
Update:
Michele has a new version of this 3d display that is combined with a projector:
Details can be found at:
http://volumetrics.co/
Via Hackaday
Update:
Michele has a new version of this 3d display that is combined with a projector:
Details can be found at:
http://volumetrics.co/