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Mainboard fan making noise, want to replace


rb9999
(@rb9999)
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My mainboard fan started making a whirring noise that varies in intensity. It isn't hitting any wires or anything. I am assuming the fan is probably bad. I was planning to eventually replace it with a quiet fan anyway. I see posts about the Ender 3 mainboard fan only working when the cooling fan was running. Does the Max work the same way?  It appears to me that the fan is always working.

I see info about moving it to another location so it always runs.  So my question is, when I replace the fan can I leave it where it is if I want the fan to always run, or do I need to move it. 

I am going to get a Noctua fan and hook it up to a buck converter.

I see many articles and videos on how to do this. Do any of you recommend any in particular?


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holmes4
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The mainboard fan on the max is wired directly to the 24V power input, so it runs all the time.

I am not a big fan (!) of Noctua fans. They are quiet, but they move little air. They may not be bad for this purpose. 


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rb9999
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Yeah, I see mixed opinions on those fans too.  I may just try to find a suitable 24v replacement.


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kevin
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@rb9999  I see posts today that say that connect 2  Noctua  12 V fans in series for two always-on fans inside the control box. Maybe that is a good idea.


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stesmith74
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@rb9999 Not sure if you are you after recommendations for a tutorial or a converter? I am a full on Noob at this, ive owned a printer now for about 6 weeks, and ive changed all 3 fans for 12v Noctua models. The hot end and motherboard for replacement 40mm ones and the PSU for an 80mm with a printed PSU cover. It has made a MASSIVE difference, i can now sit on a work Teams call with the printer running 3ft behind me. Below are links to the converters and tutorial that i used. having the LED display on the converter made it so simple (not as simple as me though, i put the power through in the wrong direction on the first attempt Doh!)

Buck converter -  https://www.amazon.co.uk/gp/product/B08JQB3NSR/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

PSU fan swap -

Hotend/Motheboard fan -


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EndersX74
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@holmes4 I have just assembled the Ender 3 Max and have yet to print anything with it. Am stuck messing around with trying to find out why the thing is soo noisy. It sounds like a jet engine as soon as turn it on. The mainboard fan is going at what sounds like 100% PWM as is the left hotend fan when it is switched on and idle. Is this correct? Is there something wrong? I have double checked all my connections and system seems to be indicating the fans are at 0% but as said sounds like it is taking off? Any help would be greatly appreciated. 


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holmes4
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@endersx74 The behavior you describe is what I have seen too. The stock mainboard fan is VERY loud. I don't have the Creality board anymore, but I recall that the left part cooling fan did tend to run a lot. I think that the way these are wired, PWM affects only the right-hand fan.

I replaced the mainboard fan with one from TH3D.com and it is much quieter. I don't find the part fans to be exceptionally loud, but controlling them seems problematic.


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Matthew
(@mbbrewerca)
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I agree with @stesmith74.  I've been running my Ender 3 with a Noctua fan on each my main board and on my hot end, each with buck converters.  The difference in sound is quite notable, and I haven't had any issues with overheating since doing it.  While the Ender 3 is a great machine, this upgrade makes it even better.  I've had the machine a few feet from me while printing and I've hardly noted that it was even on.  I highly recommend the modification if you're looking to replace the fans, and at the same time you'll make it quieter!


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