PLYUMP peristaltic extruder (no replies)

Hi!
For the last months i have been playing/designing a peristaltic extruder for my printer.
Here you can see some demos:
http://www.youtube.com/watch?v=5r0t-Qg7vVA
http://www.youtube.com/watch?v=L4zxIf46S3k
http://www.youtube.com/watch?v=9pFjEbcMk1Q

I have start documenting everything here:
http://lyulyulyulyu.tumblr.com/post/60091436004/plyump-intro-1-of-5

I would thank any opinions, comments, suggestions or feedback.
Thanks a lot!