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Extruder stepper kissed goodbye
It appears that finally the extrusion stepper abandoned me: indeed, this one I mounted as extruder used to be the stock Y-stepper, which I swapped with the stock extrusion stepper and placed it to extrude the filament, placing the stock extrusion stepper in stead of the stock Y one, to see whether it was the latter to have problems in moving the Y belt (but then the issue was discovered to be a matter of drivers: though I leaved them as they are). Anyway probably I had the extruder working for long and finally it went broken: when I try to turn it up or down thru the up/down "buttons" of the "extrude" section, it dosn't turn, but tries to turn, vibrating to and fro, acting like jammed.
I don't have handy a substitute with fitting specs from JG: during all the period I owned this printer, I bought many steppers in order to substitute the ones that went broken (specially one of the ones of the Z-driver), but they wasn't fitting 'cause of the wiring and/or voltage/amperage (I wasn't aware that there was need of specific qualities). Some have the wiring with black at 3d from left instead of 4th from left. Anyway, I cannot ascertain if the culprit is the stepper.