Hi guys, I've recently fit my e3d lite and bowden titan and since doing so my extruder will do this strange, very fast retraction movement at random intervals throughout the print. It happens regardless of slicer used printing pla only, at 220 celsius speeds are around 50 mm/s causes weak stringy sections stepper motor is HOT titan wheel scrolls freely if moved by hand and requires the lightest of touches fitted a brand new nozzle (i presumed it was a blockage at first) happens with retraction disabled Here's a video of it in action, it's hard to see but easier to hear. Each time it makes that noise it's retracting about third of a wheel turn of the big wheel. I spoke to the guys at e3d already, and they were unable to say exactly what is causing it but have offered to send a couple of replacement stepper motors to see if it's a faulty motor. Let me know if you have any ideas.