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MMU3 MK4 - Idler very noisy / ratteling  

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GarlicGnome
(@garlicgnome)
Active Member
MMU3 MK4 - Idler very noisy / ratteling

Hi,

after bootup and during rotation operation when the Idler turns, there is a very loud Ratteling. At which place could i check to mitigate this issue. It seems multiple People have this Problem, as ther is also a Thread on the Subreddit - my Idler Sounds exactly as this.

Idler Noisy Rattle

As opposed to this Video, where it is almost Silent.

Idler No Rattle

It's hard to pin the Location of the Rattle - but maybe you have some ideas.

Posted : 20/04/2024 4:24 pm
Steve
(@steve-6)
Estimable Member
RE: MMU3 MK4 - Idler very noisy / ratteling

I just finished my MMU2S to MMU3 upgrade for my Mk4 and I have the exact sound.
Being an upgrade kit, I reused the same motors from my MMU2S.

The MMU3 seems to be working fine, but the sound is annoying.
I haven't checked the build yet, but am normally very careful so I'd be surprised if it was an assembly issue.

I might try and discuss with Prusa support when the wait times aren't as long as they were earlier this evening.

Posted : 23/04/2024 2:42 pm
Papacrown
(@papacrown)
Active Member
RE: MMU3 MK4 - Idler very noisy / ratteling

I've got the exact same issue, works flawlessly but I have that rattle noise. I have completely disassembled and reassembled the unit and the noise is still there. 

Posted : 23/04/2024 7:14 pm
Shushuda
(@shushuda)
Estimable Member
RE: MMU3 MK4 - Idler very noisy / ratteling

The exact same issue here. The unit works flawlessly, but each time the idler spins to change the position - loud rattle/creaking/buzzing. Kinda bearing-like.

Posted : 25/04/2024 3:58 am
Fnord Prefect
(@fnord-prefect)
Active Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Same here - any news on this?

Posted : 28/04/2024 8:09 pm
Gandalf The Red n Gold
(@gandalf-the-red-n-gold)
Member
RE: MMU3 MK4 - Idler very noisy / ratteling

I have exactly the same condition but it is working perfectly.

Michael Borger[email protected]

Posted : 29/04/2024 1:18 am
SirMaxwell
(@sirmaxwell)
Member
RE: MMU3 MK4 - Idler very noisy / ratteling

I have the same Issue (mine is a 2nd Day Order unit) when its spinning the Idler it sounds like something is gonna break, scratch or whatever broken. Crazy noise doesnt sound healthy at all. 

Posted : 30/04/2024 11:02 pm
featherz
(@featherz)
Eminent Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Guys, I found the rattle on mine completely by accident. My lane 5 was refusing to load any filament so I took the whole thing down and noted the idler was a bit tilted and loose on that end - the little rod that was supposed to hold it in the bearing fell inside the idler so it was rattling around inside. I didn't manage to get it out, but thankfully I had a spare. So you might want to check if anything actually came loose inside the idler.

Posted : 02/05/2024 9:20 pm
Fnord Prefect
(@fnord-prefect)
Active Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Good catch, thank you for sharing! I will check mine tomorrow.

Posted : 02/05/2024 9:34 pm
Papacrown
(@papacrown)
Active Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Is it the 5x16 shaft in this step?

Posted : 02/05/2024 9:40 pm
featherz
(@featherz)
Eminent Member
RE: MMU3 MK4 - Idler very noisy / ratteling

That's the one!

Posted : 02/05/2024 11:59 pm
Fnord Prefect
(@fnord-prefect)
Active Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Unfortunately that wasn't it. I disassembled my MMU3 and everything seemed to be assembled correctly. With the idler disconnected, the motor still produces what I think are unusually strong vibrations. When assembled, they of course resonate in the idler. The question that remains is, why is the motor vibrating that much? Is something wrong with the motor or can it be fixed in the MMU3 firmware?

Posted : 03/05/2024 7:24 pm
featherz
(@featherz)
Eminent Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Sorry it didn't work. I actually fished that thing out today and it rattled like a toy - and that was the only way I could get it out  - shaking the you-know-what out of it.  You never know, maybe someone else will find a 5x16 shaft missing so my experience will help. 🙂 

Posted by: @fnord-prefect

Unfortunately that wasn't it. I disassembled my MMU3 and everything seemed to be assembled correctly. With the idler disconnected, the motor still produces what I think are unusually strong vibrations. When assembled, they of course resonate in the idler. The question that remains is, why is the motor vibrating that much? Is something wrong with the motor or can it be fixed in the MMU3 firmware?

 

Posted : 04/05/2024 6:05 pm
Doubledutch
(@doubledutch)
New Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Just finished the MMU3 assembly (MK3.5) and started the first print; the idler makes the exact same rattling noise as in the video. It prints fine and filament changes are happening as they should, but the noise is annoying. 

Posted : 09/05/2024 11:04 pm
Papacrown
(@papacrown)
Active Member
RE: MMU3 MK4 - Idler very noisy / ratteling

So after a few prints, this noise has gone down drastically, basically being non-existent for me, don't know if something just settled in the idler or what happened, but its gone. 

Posted : 13/05/2024 10:14 pm
Nox liked
Nox
 Nox
(@nox)
Member
RE: MMU3 MK4 - Idler very noisy / ratteling
Posted by: @papacrown

So after a few prints, this noise has gone down drastically, basically being non-existent for me, don't know if something just settled in the idler or what happened, but its gone. 

I can confirm this - the same thing happened with my MMU3 👍

Posted : 15/05/2024 6:10 pm
Shushuda
(@shushuda)
Estimable Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Not in my case. Still rattling as much as it did before. I've been printing a lot, almost 10.000 changes currently, and no difference in sound.

Surprisingly enough, moving the idler manually doesn't produce any sound. It's just when the motor moves it. I've opened it up, cleaned it, moved it around etc and it didn't help.

Posted : 16/05/2024 3:55 am
L Y
 L Y
(@l-y)
Member
RE: MMU3 MK4 - Idler very noisy / ratteling

Same issue here. Loud rattling when idler spins. Prusa support not much help. 

Posted : 17/05/2024 1:20 am
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