Same thing is happening with me after replacing the fan. This is clearly a firmware issue imo
I have a brand new Bambu X1C printer that I received a bit more than a week ago.
When I powered on the printer for the first time and connected it to wifi, it said it had a firmware update. Did the update, and did some prints.
Was quite positively pleased that the printer was not as loud as my previous decade old Ultimaker 2 workhorse.
I keep the printer in a separate room that is connected to my office room, with a closed door in between.
Yesterday I wanted to dry some PVA filament, but noticed that X1C “Dry Filament” option did not have an option to choose to dry PVA. Browsing the menus, I realized there was another firmware update available (previous update having taken place just a week ago), so I decided to upgrade to that to see if PVA drying would now be available in the menu.
Updated firmware, and reran the whole calibration sequence. (PVA drying is not listed in the menu, so I dried it as PA. Hopefully close enough)
However, after that update, I notice that the printer is all of a sudden noticeably louder than before the latest firmware update. I don’t have the version numbers since I didn’t think to make note of them, but there is definitely a difference.
Bambu Studio lists “Part fan 100%”, “Aux fan 80%”, and “Chamber fan 90%” in my current print. Reducing the fans to 50% does help a lot with the noise, although I don’t think I’ll do that as a solution, since it could affect reliability.
I wish these fans were quiet - would love to do a Noctua treatment here, though the fan curves and functional parameters would probably be all over the place after that, so not quite sure that would make sense. I wish manufacturers would be serious about choosing quiet fans, those would help the comfort of maker spaces by quite a bit.
I have the same issue. The fans are not even at static speed, they fluxuate and makes them sound even more weird. I have manually reduced the speed (but it changes after every filament change). The printer is sitting next to me. Before the update the noise was bareable, now it’s not. Bambulab, something is messed up.