LUCAS extruder - finally a really universal extruder

UPDATE August 14th
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Please check out version 2: http://www.thingiverse.com/thing:428312
While this is still working very well (the servo version at least), the improvements of the new version are worth it!

UPDATE July 29th
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I have been having an amazing feedback from you, lots of amazing suggestions to improve the design. Thank you very much!
Unfortunately I haven't had free time to work on it as I wanted, so the project is on a temporary halt. I have updated a couple of files h