Noisy Fan on UM2

[andrea3d 0]

Hi, the hot end (5V) fan on my UM2 is very noisy. I have taken out the fan and inspected it, but found nothing wrong. Anyone has any idea how to reduce the 5V fan noise? Can the fan speed be reduced and is it ok to do that? Thank you.

 

[Dim3nsioneer 557]

The 5V fan on my UM2 was noisy as well. This is what I did:

- I inspected the fan and thought it might be vibrating

- so I pushed with a screw driver onto the case to check

- I was clumsy enough to touch the blades with the screw driver while the fan was running. result: two blades broke out and THEN it was REALLY noisy.

- I ordered a new 5V fan from ebmpapst and mounted it: silent.

I recommend you skip the second and the third point, especially the third point. You may also skip the fourth point and ask Ultimaker for a replacement.

 

[3poro 9]

- I ordered a new 5V fan from ebmpapst and mounted it: silent.

 

Which model did you choose? I can't find anything nearly as powerful from ebm-papst, normally I use their fans whenever possible.

 

[Dim3nsioneer 557]

525N, I think... works fine...

 

[3poro 9]

I guess you have 255 N. There is also 252 N, but that uses higher voltage. The 255 N is pretty quiet (16dB), but its air flow is also a third lower than that of the original UM2 Sunon fan. But - if it works, great!

 

[Dim3nsioneer 557]

Of course, it's a 255N (sorry for the typo). I have to add that I only print PLA and PET. So 245°C has been the highest temperature my UM2 has ever reached.

I think the effective difference of the air flow is not that big. You have to consider the fact that the heat sink has an enormous flow resistance and air flow of a fan is usually measured with zero flow resistance. Thus, the air velocity will be about the same and it's the air velocity which determines the amount of heat which is transfered from the heat sink into the air.

btw: There is also a 255H with 0.6W if I'm not wrong.