SHORT: Problems using orientations and locations of the filaments spools other that the original*.
LONG: We had a client with a feeder grinding filament on long prints (over 6hs) to the point of no extrusion after a while.
After checking almost everything possible: drivers, hobbed bolt, bowden tube, PCBs of printhead and motherboard, printcore, etc, we detected a significant wear over the lever of the feeders (Image wear_1 & wear_2).
Our hypothesys was that the filament had been feeded in the wrong orientation and it was later validated with the client (image wrong_orientation). The spools were mounted perpendicular to the original orientation of the spool holder. So far we swaped the levers (right to left and so) and the printer is working fine again but the proper solution would be to replace the damaged part and ensure that the Filament is feeded properly from now on.
