I loved the performance of this extruder. I wanted to continue using it with the e3d revo micro as it worked fine and the results were as expected. So I decided to modify it and adapt it to work with the E3D Revo Micro. I have also added a piece to be able to use a 5015 blower fan.

Original design description @makergal https://www.thingiverse.com/thing:755164:
"Extruder for Prusa I3/ Steel or similar

Designed for flexible filaments, trying to have zero cleareanse between the Mk7 Pulley and Bearing and PTFE tubing to better filament movement.
With this upgrade, the filament could not roll up in mk7, which is on of the biggest problems with this type of materials.
For 1,75mm filament, printing at 60mm/s without problems in my Prusa i3 Steel
The stepper used is a Nema 17 40mm depth and a 15mm spacer, check you stepper before printing and modify the spacer to fit your stepper"