LUCAS extruder version 2

EDIT 23/09/2014
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I have just uploaded a new 2.01 version with minor updates and I'm unchecking the "work-in-progress" checkbox, since I have been receiving lots of positive feedback about this project, from which I understood that it is working as expected. YAY!
From my personal experience, I can say that replacing and removing hotends for maintenance is a piece of cake, and I have been swearing a lot less lately.
I still need, though, to write a step-by-step guide and a complete h