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Thank you for taking the time to reply to my questions!

Yes, I have seen the Delta extruder, but as there was little info on if and how good it works, and I did not see that coment! Thanks, I'll check it out.
I thought it may be better to use two 28byj (As they cost ~80 cents and I was considering a simple repstrap variant where two motors just sit next to each other with adjustable tension, and this would be easy to build.

Yikes, thanks for the heads up on the 12v version. I did a lot of reading regarding these motors and saw some tests where the 12v had more torque (https://grahamwideman.wikispaces.com/Motors-+28BYJ-48+Stepper+motor+notes), but it kind of makes sense that driving it at 12v after the uni/bi polar mod won't drive it at full potential.