Jon Wise demonstrates his Raspberry Pi 3D Printer, he is using a pen in the demo but it can use an extrude to print items. The mechanical movements leek very complex when compared to a standard XY table that is controlled using 2 stepper motors. The Pi has enough number crunching ability to get the job done though. I can’t wait to see this printing a complex shape, the movements are interesting to watch, it reminds me of the robot hands that use angular joints to move around.
Via Hacked Gadgets.

the code, by the author…
http://www.raspberrypi.org/phpBB3/viewtopic.php?t=40531&p=331314
The code, by the author…