Hi all,
I wanted to share a finding with my newly purchased A1 printer which I think can help out other people having the same issue.
I noticed high noise levels during my first print and could not figure out why. After messing around with the printer and reading forum posts I still could not find the root cause of the noise. From what I can tell there are a lot of people having problems with fan noise (even on other models than the A1) which they thought would be solved by swapping the MC fan. However, it seems to me that this did not resolve their issue.
I managed to isolate the noise issue to the part cooling fan. I proceeded to remove the four screws that hold the bottom cover to see if I could spot any clear malfunction but I didn’t want to damage the plastic cover so I never managed to remove it. I then re-installed each screw one at a time and ran the fan at 100% speed using the Handy app in between. This is where I found the root cause: the rear right-hand screw (looking from the front). The screw is too long and therefore interferes with the fan blade. I resolved the issue by unscrewing it slightly.
The plastic cover is still held firmly in place by the remaining 3 screws (and snap-hooks I believe) so I doubt there will be any issues that stem from leaving this 4th screw slightly unscrewed.
Hope this helps, it’s always tedious trying to find solutions to issues like this online.
TLDR;
If you experience unusual/unwanted noise emitting from the printer, try slightly unscrewing the REAR RIGHT-HAND screw on the bottom of the part cooling fan. The screw interferes with the fan blade when fully tightened.
/ Niklas