@Sethipus:
The 30mm coldend fan on my Chimera print head and the internal fan of the Meanwell power supply are much quieter than the fans on my i3, too. With the "silent as the grave" TMC 2660 drivers powering the steppers on my D-bot, that thing is extremely quiet even while printing at high speed. It's always jarring to me when I watch a Youtube video of someone else's printer and it's got that loud and eerily musical stepper whine going full blast during a print. It's just a reminder of how nice the Duet Wifi is. In my view it's truly the Cadillac of 3D printer controllers.
Many users, myself included, have found that because the steppers are so quiet, after period of time other sources of noise which weren't noticeable before, start to become intrusive. In my case, I changed to a fan less power supply which I am able to do because my bed has a mains heater. Then I have made full use of the thermostatic fan control options. The cold end fan is set to come on at 45 deg C so below that, it is off. I've also installed fans in my Duet enclosure which blow onto the back of the board but again, these run in thermostatic mode. I stuck thermistors on one of the stepper driver chips on both the Duet and the Duex5 so again, these fans although very quiet, never run unless the stepper chip gets above 45 degC. So when the machine is idle, it is totally silent (well apart from a very faint buzz from the steppers once they have moved and are running on the holding current). I'm even considering turning the steppers off completely at the end of every print because I always home at the start of every print, it wouldn't matter, but that's probably overkill.
