I have a strange probleme with my UM2+ Extended: Sometimes (Not everytime on the same position) the feeder is pushing material out instead of retracting.If its haapening, it is realy pushing out material. You see it very well on the attached pictures. I swaped the extruder stepper motor, changed firmware, reduced exdruder current, sliced different models. But nothing helped so far. If somebody has an idea, it would be greatful to have an idea where to find the solution of this problem.
In this Image the line in the circle and the bulb in the middle of the object ist the Problem.
Best regards Beguggamin