Many thanks for you post, V interesting & heartening
I have been discussing with a developer and tinkering away in the background with a view to getting a hacked (butchered) front end of EMC2 doing the sameish thing with an Arduino - Atmel chip - Gertboard
http://www.raspberrypi.org/phpBB3/viewt ... =63&t=9490
Not much output as yet, as still looking at feasability.
Please post and update further developments as they occur. I'm V interested in in the 3D printing thing, and am in the process of building a reprap ish contrivance.