That is what I suspected from my experience with PC fans… but I couldn’t find anything on a first superficial inspection. If I find the time I will try to take out the fan and give it a proper inspection.
Might be worth considering to replace it with some well known high quality brand fan …
I was actually thinking the same. Havnt checked if its 12v or 24v but looks to be a 120mm. A phanteks t30 would be nice. If its not too thick. A Noctua A12 Industrial PPC 3000RPM would definately flow enough, but probably louder.
Just for slightly less noise. It may be hard to find a fan with this much pressure thats also silent.
You can find the fan Bambulab uses on the bambu store:
But I was not able to find the brand and more specifications.
It is a 24 Volt fan for sure according to the picture 
Replacing it with a noctua makes sens if Bambulabs doesn’t offer a replacement fan (I opened a support ticket. Let’s see if they offer a replacement fan).
The model seems to be
Snowfan YY12038L24B DC 24V 1.6A 120*38mm
(not sure what the B stands for)
Here is a picture of the chamber exhaust fan with all information clearly visible:
I still can’t find any information about this exact fan on the Snowfan website.
Recently, mine has started making what I describe as a “weed eater” sound. What I mean is, during certain times, it sounds like my neighbor is outside with his weed eater going, at first, that’s what I actually thought it was until it happened during a rainy day. Has anyone else noticed that? It doesn’t happen the entire time, but when it does, it sure sounds like a muffled weed eater. I’m trying to isolate it.
Isn’t that the part cooling fan changing speed due to overhangs etc. ?
Maybe? I’m not sure, this is my first 3D Printer and I’m still learning everything. It doesn’t make that sound constantly, so still watching it to determine root cause. I’m an IT engineer so I’m still investigating. It’s definitely a “neighbor using a weedeater 3 doors down sound” when I hear it. It’s not constant. I’ll take a look at the fan speeds.
Does your part have any overhangs? I have just been printing a part with overhangs in PETG and it makes the same sound.
Thats interesting that you ask. I’m printing something for the first time in PETG. It does have some small overhangs from what I can tell in the slicer, so perhaps thats the root cause. Did you adjust the overhang fan speed?
The slicer does this automatically. Is part of the material profile. This is standard behavior. Nothing wrong with the printer.
That’s good to know, thanks for the reply.
mine also makes the sound… sounds almost like a fridge in standby… but in standby the fans arent running so i doubt the sound is from the fans…
sound more like coil whine or a capacitator vibrating… i think i will open a ticket … because if it makes any problems in the future at least i told them already…
It’s definitely coil whine/inductor whine, which is harmless and only annoying. But if you can get a part out of support for it then why not
Same exact sound.
Its the only annoying sound of the machine.
Its easy to hear with the printer not printing and turning the Chamber exhaust fan to 30%
30% is the value setted by the bambu hd2 profile for pla for temps under 35°c
I listened to the fan on every video and all I hear is normal computer fans 
I definitely do not hear a near scraping sound.
