Dual Extruder / Dual Material Makerbot

This is going to be a reaaaal long one, folks. Better buckle up your thingibelts.

I believe this project is complete. There are workable, though probably not ideal, solutions to all major problems. The code and mount are both perfectly usable.

Youtube videos availabe at:
http://www.youtube.com/watch?v=tSp8FKgoY8k
http://www.youtube.com/watch?v=mv3wxvR8w5A
New! http://www.youtube.com/watch?v=XafKYIxlgBk

For people who just want the short version to go with the photos: Of course