This is a very common complaint. My UM is 7 months old and nice and quiet but occasionally the fan is noisy and I knock the UM and it goes quiet or I just wait 30 seconds and it fades away. But I'm one of the lucky ones.
That sounded like it was hitting something so I would take it apart first and power it up while not attached to the board (not for long though! don't want to overheat anything) and see if maybe the fan is hitting the fan duct?
But lots of people say oiling it helps. Plus many people found alternate parts that are higher quality and the exact same size. So if oil doesn't help google "ultimaker fan replacement" or something similar.
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IRobertI 521
Ugh, that sounds pretty annoying hehe. What you could try before asking for a replacement is to peel back the sticker on the fan and put a small drop of oil in there and see if the noise goes away. It helped on my fan which was slightly noisy and I know that it has helped others as well. Unfortunately the quality of that fan is pretty crappy.
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