Hotend fan high pitch noise

Bambu Lab P1 Series Troubleshooting
1

Hello, i am a newbie with a P1s that i am enjoying very much, after a couple of months of (moslty) hassle free PLA and PETG printing i started trying with TPU and… i got my first clog with filament stuck in the hotend.
Following wiki, forums and youtube I removed the hotend and remove the broken filament, so far so good.
I have (supposedly) mounted everything back to normal, however now i can hear a faint high-pitched noise when the hotend fan start (nozzle temp above 50C) that i could swear it was not present before the disassembly.
The fan fins can move freely… (i removed some filament strings that were present),
Any idea of what i might have messed up reassembling the hotend?

thanks in advance.

2

Do not think you messed up , you can probably take off the fan try to clean, use high pressure air, and use a drop of oil , but after some time they tend to do that . Probably you have not been paying attention and with dismantling a bit worsen .
on X1C mine are all doing that but kinda been postponing to replace

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