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I'm using the MakerFarm version of this. What I noticed is as the motor tries to extrude, the large gear turns, turning its inset nut with it. This of course turns it clockwise along its axis, toward the extruder side, subtly tightening the hobbed bolt against its washer/bearing on the other side. The hobbed bolt eventually gets shoved up against the washer/bearing so tightly that the motor can't extrude. Is there any workaround for this? Has anyone experienced this?