Still, my extruder drive spring is like 15-16mm long.
Can you send a photo? This area of the UM changed in the last 6 months. But are you sure you are measuring the spring length and not some other distance? Also 11mm is the length with filament in the feeder *and* the feeder closed onto the filament.
That's odd, as the spring without tension should be about 17mm...
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