I am having a consistent issues with my feeder grinding filament rather than feeding.  What does this grinding/feeding issue look like? When the filament gets stuck at the extruder head or flattened by the feeder axis, the toothed wheel grinds a semi-circle into the filament.  See here.  This is occurring nigh-constantly on Feeder 1 of my machine.  It always occurs during the same point of the cycle: about two layers in, the surface of the print begins to look sputtered as it is failing.  Then n