Bad Vibrations
Hi,
I got my Core One on Tuesday. Yesterday I noticed that it causes very strange vibrations at certain speeds, which sounds really annoying. Do any of you have the same problems?I will link 2 videos here and one from a user on Reddit. I asked him for permission to link his video here. Thanks for that.
Video1(Reddit User): https://drive.google.com/file/d/1zIRUpOxvKbxX1axxFDzwJXd2llBJ_nNP/view
Video2: https://drive.google.com/file/d/1xSH24GtOmZrpb0oVeTMGv-muq2-_DV8a/view?usp=sharing
Video 3: https://drive.google.com/file/d/1vn1MmRWzNYe2cmueXFN_ytKZySeAFWbw/view?usp=sharing
RE: Bad Vibrations
I’m experiencing the same issue. It seems like certain frequencies are causing the metal frame to vibrate, which creates that sound. I did install the foam strips on the bottom, and I imagine it would be much worse without them. Do you think a firmware update could help address this? Maybe something similar to the noise reduction tuning on BL printers? It would be nice if Prusa could implement a fix for this. All of my printers are in my workshop, but I planned on keeping this one in my office for prototyping. But the noise may interfere with online meetings.
RE: Bad Vibrations
I am the redditor and I second this. I can't use my printer now because of this...
RE: Bad Vibrations
I could imagine that phase stepping like the XL could help here. Unfortunately, Prusa is still working on it, which is why the calibration has been deactivated for the time being. Was written to me in the Github repository by one of the devs.
RE: Bad Vibrations
It sounds a lot like when the XL came out. It was very noisy just like that. After they implemented the phase stepping I'd became nearly silent. Hopefully they can do the same here.
RE: Bad Vibrations
My MK4S also makes that louder humming sound, almost as if it is hitting some resonance frequency once in awhile, but doesn't have the added sound of something on the frame rattling. Hopefully they have it worked out before I receive my upgrade kit.
RE: Bad Vibrations
Has this issue been documented over on their Github pages?
--> MK4 - MK4S - MINI+ - MMU3 - Accelerometer Guide - BambuLab A1 Combo <--
RE: Bad Vibrations
Has this issue been documented over on their Github pages?
Where on the Github would you put such an issue? I can only find repositories for firmware and software, and for (older) 3D-printed parts. Where would issues concerning the overall machine design, and the MK4S and Core One in particular, fit in?
RE: Bad Vibrations
https://github.com/prusa3d/Prusa-Firmware-Buddy/labels/feature%20request
RE: Bad Vibrations
I could imagine that phase stepping like the XL could help here. Unfortunately, Prusa is still working on it, which is why the calibration has been deactivated for the time being. Was written to me in the Github repository by one of the devs.
On the XL, phase stepping calibration requires the use of the built-in accelerometer. How would Prusa enable it on the Core One which does not have that sensor? 🙄
RE: Bad Vibrations
I could imagine that phase stepping like the XL could help here. Unfortunately, Prusa is still working on it, which is why the calibration has been deactivated for the time being. Was written to me in the Github repository by one of the devs.
On the XL, phase stepping calibration requires the use of the built-in accelerometer. How would Prusa enable it on the Core One which does not have that sensor? 🙄
Tune it out at the factory and release it out with the firmware just like they did input shaping.
RE: Bad Vibrations
On the XL, phase stepping calibration requires the use of the built-in accelerometer. How would Prusa enable it on the Core One which does not have that sensor? 🙄
Tune it out at the factory and release it out with the firmware just like they did input shaping.
Not the same thing, I believe. For the Input Shaping, Prusa established a fixed set of parameters which is meant to work on every Core One they ship. The phase stepping is unit-specific, since it is meant to compensate for manufacturing variances in the individual motors. The printers would need a permanent parameter store (which survives a hard reset) to support unit-specific factory calibration, which I don't think they have.
And how would this calibration work for kit builders? If the vibration noise is really a major issue and needs phase stepping to fix it, I would expect the accelerometer to be added as a standard feature soon.
RE: Bad Vibrations
On the XL, phase stepping calibration requires the use of the built-in accelerometer. How would Prusa enable it on the Core One which does not have that sensor? 🙄
Tune it out at the factory and release it out with the firmware just like they did input shaping.
Not the same thing, I believe. For the Input Shaping, Prusa established a fixed set of parameters which is meant to work on every Core One they ship. The phase stepping is unit-specific, since it is meant to compensate for manufacturing variances in the individual motors. The printers would need a permanent parameter store (which survives a hard reset) to support unit-specific factory calibration, which I don't think they have.
And how would this calibration work for kit builders? If the vibration noise is really a major issue and needs phase stepping to fix it, I would expect the accelerometer to be added as a standard feature soon.
I guess we'll see. I did notice that the CNC kitchen review did mention that the printer was louder than previous Prusa printers.
RE: Bad Vibrations
Regarding the XL, Joe Prusa has posted that they test (and presumably select) the stepper motors in production now, so phase stepping is no longer that relevant. Maybe that's an option for the Core One as well -- as long as the share of "bad" steppers is small, or Prusa has enough less critical applications where they can use those motors.
RE:
You simply use the accelerometer kit which is available to buy and which I also have. It works perfectly. I tested it already with the IS calibration.
I could imagine that phase stepping like the XL could help here. Unfortunately, Prusa is still working on it, which is why the calibration has been deactivated for the time being. Was written to me in the Github repository by one of the devs.
On the XL, phase stepping calibration requires the use of the built-in accelerometer. How would Prusa enable it on the Core One which does not have that sensor? 🙄
RE: Bad Vibrations
I think you misunderstood Jo's post.
Regarding the XL, Joe Prusa has posted that they test (and presumably select) the stepper motors in production now, so phase stepping is no longer that relevant. Maybe that's an option for the Core One as well -- as long as the share of "bad" steppers is small, or Prusa has enough less critical applications where they can use those motors.
RE: Bad Vibrations
I have the same issue / vibration on the x axis. The print quality on the x axis isn’t great either.
Could it be bad bearings or something misaligned causing binding? I have no idea
RE: Bad Vibrations
I think you misunderstood Jo's post.
Can you help me understand it correctly then? He shared a very striking example of the benefits of phase stepping, but with the disclaimer that it would be nowhere as impactful in the units they were now building:
Keep in mind that on the production XLs the difference won't be that visible if at all - we test 100% of the motors going out since the start of the production to be pretty much perfect. But the results from this test are just too cool not to share!
I understand that to say that the "100% tested" motors don't benefit from phase stepping as much, if at all, since motors with excessive tolerances will not be used. How would ou interpret it?
RE: Bad Vibrations
You simply use the accelerometer kit which is available to buy and which I also have.
You need to buy an optional accessory -- which Prusa decided to omit to save a few bucks -- to be able to calibrate the printer to stop it from rattling? For a $1000 printer? Come on.
When I ordered the Core One kit, I knew that I would not get a particularly innovative printer. Prusa is only catching up with the competition at the moment, and I'm aware of that. But I was very much expecting to get a particularly well-built printer -- both regarding its design and its manufacturing quality. Sadly, the threads in this forum section seem to tell me that I was expecting too much.
RE: Bad Vibrations
It is simply meant that the picture shows the effect of phase stepping more clearly, because bad motors were used especially for the picture to make it clearer. With the motors that are installed in the printers, however, the difference will be less clear, because motors like those used for the comparison in the picture are not installed in the devices, as 100% of the motors are tested beforehand and such motors are sorted out. This is only to prevent you from wondering at home why the difference is smaller for you.
I think you misunderstood Jo's post.
Can you help me understand it correctly then? He shared a very striking example of the benefits of phase stepping, but with the disclaimer that it would be nowhere as impactful in the units they were now building:
Keep in mind that on the production XLs the difference won't be that visible if at all - we test 100% of the motors going out since the start of the production to be pretty much perfect. But the results from this test are just too cool not to share!
I understand that to say that the "100% tested" motors don't benefit from phase stepping as much, if at all, since motors with excessive tolerances will not be used. How would ou interpret it?