PSU sounds like percolating coffee when idle  

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joshua-1
(@joshua-1)
New Member

Just got my Prusa MK3S kit version all set up and running a couple days ago, and print-wise it's running like a champ.

However, I'm not sure if it was doing it the first 1-2 days, but my Power Supply (PSU) is now making a constant sound like coffee percolating-  a sort of constant electronic hum, with constant, irregular differences in the noise, similar to coffee percolating, or perhaps similar to the arm of a mechanical hard drive randomly seeking to different sectors.

It makes this sound whether the printer is idle, or under load.  (both extruder & bed pre-heating bed)

It's not incredibly loud, but it's loud enough I can hear it from across the room 15 feet away without straining, and it's annoying to sleep in the same room as it.  🙂

 

Any thoughts on this?  Is this normal?  Did I receive a 'bad' PSU?

Posted : 19/02/2020 6:08 am
Max
(@max-distortion)
Honorable Member

please upload a record.

Posted : 19/02/2020 8:04 am
joshua-1
(@joshua-1)
New Member

@max-distortion

Unfortunately, I do not have a high-quality microphone.

I have attached it as recorded by my phone.

PSU Noise 01

 

Note that this is with the hotend fan off, and the part cooling fan off.  The printer has been completely idle for hours.

This post was modified 8 months ago by joshua-1
Posted : 20/02/2020 2:28 am
Karl Herbert
(@karl-herbert)
Famed Member
Posted by: @joshua-1

Just got my Prusa MK3S kit version all set up and running a couple days ago, and print-wise it's running like a champ.

However, I'm not sure if it was doing it the first 1-2 days, but my Power Supply (PSU) is now making a constant sound like coffee percolating-  a sort of constant electronic hum, with constant, irregular differences in the noise, similar to coffee percolating, or perhaps similar to the arm of a mechanical hard drive randomly seeking to different sectors.

It makes this sound whether the printer is idle, or under load.  (both extruder & bed pre-heating bed)

It's not incredibly loud, but it's loud enough I can hear it from across the room 15 feet away without straining, and it's annoying to sleep in the same room as it.  🙂

 

Any thoughts on this?  Is this normal?  Did I receive a 'bad' PSU?

I would write to the Prusa chat. Login with your account and select eshop. After 2 seconds on the rigth bottom appears the chatwindow. Maybe you should dissable first your addblocker.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 20/02/2020 11:44 am
joshua-1
(@joshua-1)
New Member

After speaking for a Customer Support person ("Steve") on the Prusa store, we came to the conclusion that it is coil whine.

However, I was a little surprised that it is "perfectly normal" to have coil whine that is pretty loud.  (It's quieter today, but yesterday it was literally louder than my extruder fan!)

Anyways, figured I should update this in case people stumble on it in the future.......

Posted : 21/02/2020 4:02 am
Max
(@max-distortion)
Honorable Member

my psu does some noise too in the first days. it sounded like a day at the beach 😀
actually its quit most of the time. maybe the condesators have to get some time to calm down.

but when its needs all his power, you can hear it working. i wil try to record the noise.

otherwise, in standby its quit.

in your case i would ask Prusar for an exchange. you´ve bought a 1000€ printer with high quality parts and not a cheap chinese build ripoff!

Cheer up!

This post was modified 8 months ago by Max
Posted : 21/02/2020 5:43 am
TheJokerSE
(@thejokerse)
Eminent Member

I have the same sound, but only after a print is finished. If i move the z-axes a little bit, then the sound disappear! Its strange

Posted : 09/08/2020 11:05 pm
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