well I did several things to improve noise on my print head when I received my UM2, before going to change the rear fan.
The metal holder of the lateral fans was making a noise because fans were lose, I was unable to screw them because they were over tighten , so I just hold them in place with hot glue, and it work!
I remove the fan stickers that were eccentric and that improve vibrations and noise.
Remove cables from air flow, hold them lateral with hot glue.
Then I change the rear fan as describe, just cut the cables and re solder the new fan to conserve that jst connector. You have to give attention to fan rotation when you connect he fan again, as changing polarity changes direction.
Hope this helps
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Nicolinux 288
Weird, you are all talking about quiet fans and my fan is quiet when not attached to the head and lout otherwise. I wonder what's up with that.
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