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Glenn Berden from The MakerHive compare the Flexion Extruder against the SeeMeCNC EZ-Struder printing NinjaFlex

http://www.youtube.com/watch?v=9W1wZo4Kepo

That's impressive for a stock EZStruder. I had to make a PTFE guide for mine to handle flexible filaments. But I used the full length Bowden. The flying Extruder seems to be making the real difference.