how to fix a noisy fan

I completely took apart the ODD-fan on a 2266 i bought just yesterday with the same problem. 1. there was a tiny piece of plastic caught inside the motor-mechanism - probably causing the noise. More importantly though: There was a massive build-up of rust-dust on both bearings (3x8x4mm), probably originating from the wear of the pin they´re sitting on.

..cleaned it up, gave the pin a little grease, put a spacer between the two bearings (ca 0.5mm) to compensate the weak spring (watch for proper turning-function).

Sounds fine now - hope it will last.