I'm switching from the direct drive setup on a prusa i3 to a bowden one with a lite-6 at its heart. Originally it was a stepstruder mk7 based design. I have switched to an airtripper, mk8 drive gear, and a larger stepper motor 96oz/in. Nothing else in the printer or slicer has really changed in terms of speed except retraction. The only difference from the stock v6 i have added is ceramic fiber insulation around the heater block. Maybe this was a bad idea? I did it so i could maintain steady temps and have a cooling fan blowing nearby. Temperatures are super stable with or without the fan on, never tried without isulation. I have switched to firmware retraction so I can modify it on the fly and have tried ranges from 1.5mm 20mm/s to 7mm 80mm/s. I have also adjusted temperatures all the way down to 175 degrees (The pla im using is rated for 220-190) where under extrusion starts happening. The motor is not skipping on retraction. I have also done my best to calibrate from over extrusion. No matter what I do the nozzle seems to ooze any time it dwells or needs to stop extruding. Noticeable blobs at the end of a perimeter or at edges of infill (where direction changes significantly). My next thoughts are to shorten the bowden length (its about ~650mm at the moment) and/or remove the insulation. If/when I mount the extruder to the printer I could probably get the bowden tube to about 150mm. Part pictures below: Hotend pictures taken on my phone are too big to uploaded to postimg Extruder 1 http://postimg.org/image/mnevg9ih1/ Extruder 2 http://postimg.org/image/ur5z760lf/ Note: the dribble hanging off is shows up after even a 2mm retract at the end of a print . Can anyone give me some other suggestions? Been googling around awhile looking for possibilities, this stringing is driving me nuts.