Welcome to the SeeMeCNC Community

Just wanted to share the Extruder modification of my stock extruder on the Rostock MAx V2 when printing with flexible filaments like Polyflex: After jamming the filament indside the hobbed wheel - I've printed this modification on from Thingiverse.

http://www.thingiverse.com/make:268295

It works really great !

Hey that looks good. I have great success with ninjaflex with this : http://www.thingiverse.com/thing:1494685

Seen your solution too - it appeared too complicated for me
The result with the simple approach I'm using is stunning. It prints really well with Polyflex.