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After viewing your video, mine does the same thing. I have a Titan extruder as well with the 3:1 gear ratio. So the motor has to spin extra fast to get similar retraction speed as a 1:1 (stock) extruder. I had also turned down the retraction speed a while ago and that helped. I feel like there is a vibration component to the noise as well. If I hold the motor during retraction, the sound is further reduced. So I messed around with printing some dampning pads using flexible filament and quieted things down even more.