When I load material into the M300 dual printer, I get the error code encoder malfunction. I have checked both encoders and they work fine, the problem is that I also get the error code extruder jam when there is nothing obstructed.
Hi,
It could be dirt on on sensors of extruder PCB, incorrect mount of extruder PCB, or a failure of that PCB.
Have you tried to clean up the extruder? Not only the hotend, but the entire unit.