Vibrations when descending Z axis before printing
 
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Jean.de.BZ
(@jean-de-bz)
Eminent Member
Vibrations when descending Z axis before printing

MK4 assembled received todaySelftest ok. First impressions ok.

Z-axis movement is noisy during print preparations. But just on a slow approach. Not during rapid movements. Do you have the same resonances on your machines?

On the other hand, during movements controlled via the rotary button, no apparent problem, jerky movement for the first few seconds, then smooth.

Posted : 17/02/2024 2:35 pm
Lynn
 Lynn
(@lynn)
Estimable Member
RE:

I did the MK4 upgrade and experience this type on noise on all three axis.  I  was able to dampen, not eliminate, the y-axis and x-axis by making the belts supper tight, but I worry about shortening the motor lifespan. I haven't been able to do much about the z-axis noise which sounds just like noise in you vid.  It is my opinion that the noise is an artifact of the 400 step motors and how they are being operated.  The rotational vibration sound is then amplified through connected plastic structures.  I haven't spent much time with customer support, but if you contact start off with the vid. 

It's possible that they be able to give you advice, is so, please pass that on here.

Good Luck

 

 

v

This post was modified 3 months ago by Lynn
Posted : 18/02/2024 12:04 am
Jean.de.BZ
(@jean-de-bz)
Eminent Member
Topic starter answered:
RE: Vibrations when descending Z axis before printing

Thanks for your explanations.

Explanations via chat today :

This is actually normal behaviour since the motors move under current - it should only make this sound when its preparing before a print and later on will be gone in the print

here is no guide for mk4 but this page could still help you to find out where it might come from and make slight adjustments in case its coming from the lcd housing. https://help.prusa3d.com/article/vibration-when-printing-mk3s-mk2-5s_2177

it is not directly coming from the Z axis, it only happens when the Z is moving and it can resonate through the whole printer

Question : Is there an improvement planned in future firmware?

Answer :this is how the printer works and will be hearable before printing. its not a defect and most likely wont go away in future updates

Posted : 19/02/2024 8:51 am
Lynn
 Lynn
(@lynn)
Estimable Member
RE:

Interesting, 

It may in fact be the new normal,  but something is definitely different on the MK4. My Mk3's were very quite on all axis.

The vibration is begin generated somewhere, what we are hearing is mainly the amplification of that vibration.  The generation of vibrational noise generally requires moving parts, i. e the motors, pulleys, bearings, belts, or fans. For the X-axis we only have the motors and trapezoidal nuts. 

I feel like Prusa has been rushed to get new products on line to be competitive with new and different methods, and noisy printers is one of the more obvious consequences. The responses you got seem typical of their recent attempts  to downplay our frustrations with these noises and several other annoying MK4 attributes. 

I guess you could just stare at you printer for hours, like I have, and try pull out some Jedi voodoo to fix you own problems. I'm still seeking a solution and will post if I find it. 

 

This post was modified 3 months ago 2 times by Lynn
Posted : 19/02/2024 2:08 pm
Joel Dunham
(@joel-dunham)
Member
RE: Vibrations when descending Z axis before printing

I also just received a new assembled printed with the same noise. This is my first prusa so I guess the grinding noise is normal.

It would be nice if they could fix this. I understand it may be of no harm but it sounds like a cheap printer ready to break.

So far the mk4 has not impressed me over the Bambu X1 serries.

Posted : 25/02/2024 4:12 am
miroslav.h4
(@miroslav-h4)
Honorable Member
RE: Vibrations when descending Z axis before printing

In my opinion, these sounds are caused by choosing an inappropriate rotation speed of the Z-axis motors, when unfortunately some parts of the printer resonate. Note that these sounds do not occur when moving at a different speed. It would probably be enough to change the movement speed and the problem would be solved, but the developers don't want to do this. The problem is also that if I fix it in the FW, it's of no use to me because I won't upload my FW to the printer without losing the warranty.

Posted : 25/02/2024 8:58 am
Michi
(@michi-3)
Active Member
RE: Vibrations when descending Z axis before printing

I have the same noise on my MK4.When it levels the bed and when Z moves up and down during printing as the extruder moves from one printed part to the other.This noise really annoys me. But I haven't found a solution for this yet. 🙁

Posted : 14/04/2024 9:28 pm
LandoC
(@landoc)
New Member
RE: Vibrations when descending Z axis before printing

"This is actually normal behaviour since the motors move under current"
"this is how the printer works and will be hearable before printing"

That's a load of crap if that came from Prusa support. I bought the kit and assembled it last year, this noise never happened until many months later for me. Now it vibrates the whole table it's on.  

Posted : 07/05/2024 2:11 pm
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