Noise while idle.

There is a larger fan under the bed on the C2 (and I suspect the R2) and that might be the culprit. It is a blower style -- not this exact one, but this is the style: https://www.amazon.com/Brushless-Radial-Blower-Centrifugal-4-72x4-72x1-26/dp/B01CSNEO2G

If that is getting noisy it may need a replacement. I am not certain what voltage it is using... someone can look that up if that is the one being noisy. Lift the bottom inside cover and see if that is the culprit.

That one or the extruder fan as @Kilrah pointed out

 

quiet as a tomb -- no fan

 

On the R2 the fan is a regular blade type box fan, not a blower style, it isn't very loud and it is there to cool the stepper driver chips as well as the Arduino. It also sucks air over the rPi. It is connected to Fan2 It is connected to Pin D6 on the Arduino, so it should be controllable, but I have never tried. You can test by using M42 P<int> S<int>

Code:

M42 P6 S0 ; should turn off fan[/COLOR][/FONT][/I][/LEFT][/COLOR][/FONT][/I][/LEFT]
[I][FONT=Lato][COLOR=rgb(116, 124, 135)]
[LEFT][I][FONT=Lato][COLOR=rgb(116, 124, 135)][LEFT]M42 P6 S255 ; should run fan at full speed

​

 

Yea, consistency I guess

 

I can't get M42 P6 S0 to work, it responds with protected pin and disconnects from OctoPrint and doesn't actually stop the fan.

I think you have to enable USE_CONTROLLER_FAN in Configuration_adv.h then you can control the fan under the trap door.

 

You can also set up automatic fan on/off via temperature. E0_AUTO_FAN_PIN needs to be enabled in Configuration_adv.h then set appropriate start temp. That is where the bulk of the idle noise is coming from, unless you have an R2 with a version 1 power supply.

I am testing this now, had to do a few edits to configuration files, recompile and flash new firmware.

This is more work than I thought I think I need to edit pins.h under the #define SENSITIVE_PINS

 

I honestly dont think its the fan under the hood. You can disconnect it and the park noise is still there. Its the small 25mm fan screaming. replacing with a larger/better 30mm fan would likely fix that, but I have not yet done so YMMV

 

I agree with @Geof it is the crappy 25 mm fan. In all my PC building days I have never found any 25 mm case fan that is quiet. Upgrading to a 30 mm means printing and installing a new fan shroud. Not hard, but it may not help. I am just going to throw out a number, don't know if its accurate, but in my experience you need to buy ten 30 mm fans to come up with three that might be quieter than the rest.

 

I agree, we have used those in Pi cases (25mm/30mm) and invariably they are noisy regardless of brand. The small ones are hard to get quiet. Some of the newer cases actually use larger fans (40mm and larger) and some of those can be quiet.

 

@WheresWaldo and @mark tomlinson nailed it. Ideally you'd want 3 x 40mm fans for "quiet" but you want to make sure if you spend the time to model up a fan shroud that works with 40mm that you dont buy to weak of fans and cause more headaches than the noise is

 

mine is still currently stock and has to be for a while so no. I believe @WheresWaldo has by printing a new shroud and moving 1 of the 30 mm part fans to its place.

 

There is a thread and model you can download, modify for your own needs and print where I moved the fan directly behind the extruder cold zone. It is in the R2 modifications sub-forum