You included the STEP though I can figure it out. Thanks EDIT: also I am currently printing something in ninja flex and its not failing(yet lol ).. my change was to actually loosen the spring screw quite a bit. I just have a little bit of tension. I forgot where I saw or read but cranking it all the way down causes it to kink and jam..apparently. Anyway so far so good..It actually looks like its over-extruding for me.