Bad Vibrations  

RE: Bad Vibrations

Another update:

If I reduce the speed when printing to 95% the loud noises and bad vibrations is reduced by alot. So it seems to be a tuning thing.

RE: Bad Vibrations

Posted by: @lars-n-2

If I reduce the speed when printing to 95% the loud noises and bad vibrations is reduced by alot. So it seems to be a tuning thing.

That's something -- but not a great solution. There will probably be multiple resonance frequencies in the assembly, and depending on the geometry of the model printed and the material parameters, the print speed may hit one of them for extended periods of time. It would be a nuisance to work around the noises by having to tweak print speeds for the various layer thicknesses, quality settings, materials..., always losing a couple of print attempts in the process.

I hope that Prusa can come up with a better solution. Maybe calibrated phase stepping can reduce the excitation of vibrations, and some dampening of the panels can reduce the enclosure resonances? One thing I will probably try once I get my kit is to install foam strips between the panels and the frame parts they are bolted onto.   

RE: Bad Vibrations

I have the same experience with bad vibrations and resonance noises.

It's driving me crazy!

On some models like squares it's ok I found speeds that are working with no noise, but on big circles it's impossible to avoid rattling/vibration noises...

I really hope phase stepping calibration will fix that, for me it's a big "nope" and I prefer to use my X1C than my CORE One to print if I have the choice.

I disassembled bearings and found out that there were not enough grease in, and added more grease into the X carrier, but it changed nothing on sounds and resonnances...

Here are few examples 3 videos): https://imgur.com/a/HLPaUOX

RE:

Posted by: @lars-n-2

If I reduce the speed when printing to 95% the loud noises and bad vibrations is reduced by alot. So it seems to be a tuning thing.

Wow this does help a lot.  still has noise but cuts it significantly for me.

RE: Bad Vibrations

Im still waiting on my CoreOne so this is just speculation, but I know on my Mk4s the phase stepping noise is worst when moving at a 45 degree angle and least when moving directly X or Y.  On the CoreOne, that should be the opposite?  Has anyone tried rotating their model 45 degrees to compare the noise level?  This would be most noticeable on models that are basically square, like boxes.

RE:

Vibrations and resonance are not related to print orientation, just to speed.

If your printer resonate when going straight along X or Y, rotating your print on the bed will just divide by 2 X and Y axis speeds (for a perfect square object) so it may just avoid the problematic speed.

I tried to tune my profiles to avoid as much as possible speed that do resonate (ie 40mm/s and multiple of 40), but as soon as you don’t have only 90° angle on the bed plan, axis will go at the problematic speed at some point.

I don’t know how to explain, but for big circle for example, at some coordinates axis will travel at the wrong speed for a moment and will resonate.

RE:

Posted by: @logicwax

I'm having the same issues.   Really bad sounding resonance.    I found that rotating my model 45 degrees completely removes the sound (as well as printing at faster speeds).     I'm hoping this is fixed in a firmware update.

I also have bad VFA's too.

RE:

Yes, as I explained above, it's just a matter of speed of each axis!

If @logicwax printed mostly square/rectangular models it doesn't surprise me at all because it changes axis speeds, and so it probably avoid resonance frequencies.

Posted by: @logicwax

I'm having the same issues.   Really bad sounding resonance.    I found that rotating my model 45 degrees completely removes the sound (as well as printing at faster speeds).     I'm hoping this is fixed in a firmware update. I also have bad VFA's too.

RE: Bad Vibrations

Do we (who posted here) were the only one having a bad experience with buzzing resonance noises?
I'm surprised there are not more people to complain about that...

RE: Bad Vibrations

Of course, the internet is an echo chamber of negative experience. If everything is going fine, not much reason to tell the world about. 

Also, I just hate it when you post about an issue and then 10 people tell you everything is fine for them, five of them with an undertone that implies you're a moron who doesn't know what he's doing...

Not to be that guy... but... when I turned my C1 the first time I was like "OMG". The fan was deafening. But it pretty much stopped right away. I'd say the C1 is a tad louder than my Mk4S but not by much. Vibrations are on par with what I'm seeing on my XL. For certain movements more pronounced than others. For example, I avoid gyroid infill now. But it doesn't seem to affect quality. I do see small VFAs though. 

RE: Bad Vibrations

Some print speeds / layers / whatever does cause some noise on my printer, but overall I'm so pleased with the way things have come on since the Mk3, with that one I felt I was spending more time tweaking than printing, whereas with the core one, apart from a few tweaks from new (Bed levels, belt tensions) its just been print away!, I haven't even had to spend a ridiculous amount of time dialling in filament's.

Tomorrow will be one week of ownership, and I've already replaced the HF 0.4 brass nozzle with an Obxidian 0.4 mainly for PETG use, if you want strong prints you need to go slower as PETG needs to have time to melt into the previous layer, I will keep the HF nozzle exclusively for PLA which prints just really well but it is still PLA so I wouldn't use it for most of my use cases which is where PETG is used.

I have an Obxidian 0.6mm but have not used it yet, this is for those prints where strength is the main factor over prettiness, think functional parts.

I am well impressed with how easy nozzle changes are and the overall printing speed and good results straight out of the box, so to speak.

Yes there are potential areas for improvement (Nozzle cleaning with PETG on textured beds), but I also understand I am an early adopter for this particular printer and there may be teething issues.

I did consider the kit, but ended up buying a prebuilt, and even as an engineer who could assemble one of these without much problems, I'm glad I did. It looks like there are a lot of parts and potentially fiddly as well. Sometimes you just want to get on with it rather than spending loads of time assembling it, although for someone a lot younger than me, it would be worth it assembling to learn all about 3D printers, I've already been there got the T shirt and a bit more as I heavily modified and improved my Mk3. No need here with the core one as it is already as good if not better (Yeah OK it is better but still keeping my Mk3 for exotics and hard to print filaments which is where my mods come into their own).

So overall a positive post about the core one., yes its not perfect (what is?) but it does a good job getting there, plus you know Prusa are not going to be doing nothing more, but actively work to improve things with each and every firmware / slicer release.

A big thumbs up from me.

RE:

So both of you @chochi and @foxrun3d say that this is normal on the 3 videos? https://imgur.com/a/HLPaUO X" target="_blank" rel="noopener"> https://imgur.com/a/HLPaUOX

I mean, I may be picky regarding sounds, but come on, don't tell me this is normal for a 1200€ printer... 😓 

I had plenty of printers, from many brands, and for me it's absolutely not "normal".

RE: Bad Vibrations

Acceptable noise is VERY subjective.

I used to have a Creality Ender that had very little phase stepping noise.  But the multiple fans were deafening.  So overall, the MK4S is much quieter than the Ender.  The CoreOne is a “little bit” louder than a MK4S.  There’s no easy way to avoid the physics of having more flat surfaces to vibrate.

What’s acceptable is up to you.

RE: Bad Vibrations

That's not the motor or fan noises that bother me, it's all the unusual noises like resonance at specific speeds etc. All the noises that should not occur.

But yes you're right, it's very subjective and depends a lot on the localization of the printer (same room as you, in a closet, in garage...).

I just would like o know if every CORE One are making those noises or not.

RE: Bad Vibrations

Mine sounds exactly like that and worse when I removed the rivets from the top Perspex cover.

RE: Bad Vibrations

And that's not bothering you? Ahahah, I feel that I'm way too sensitive about those sounds... As my other printer doesn't make those sounds, my CORE One feels way less finished.

RE: Bad Vibrations

Posted by: @scott-18

So both of you @chochi and @foxrun3d say that this is normal on the 3 videos? https://imgur.com/a/HLPaUO X" target="_blank" rel="noopener"> https://imgur.com/a/HLPaUOX

I mean, I may be picky regarding sounds, but come on, don't tell me this is normal for a 1200€ printer... 😓 

I had plenty of printers, from many brands, and for me it's absolutely not "normal".

I agree. Stepper motors controlled by trinamic drivers should not sound like that in my experience. Particularly in your 1st and 3rd video, the "tones" with a pretty specific pitch seem to originate directly from the motors? I strongly hope that calibrating the phase stepping -- once enabled in firmware -- will help to make them run more smoothly. 

In the 2nd video, it sounds more like reasonably quiet motors, but some part of the frame being a bit loose and resonating. You could try touching various panels etc. while printing to see whether you can locate the culprit. Then tighten it down and/or put some dampening material between panel and frame parts. 

RE: Bad Vibrations

So both of you @chochi and @foxrun3d say that this is normal on the 3 videos? https://imgur.com/a/HLPaUO X" target="_blank" rel="noopener"> https://imgur.com/a/HLPaUOX

Never said it was normal. It's certainly worse than what I see (or hear) on my C1. Can't tell from the video where the sound is coming from.

RE: Bad Vibrations

Recently had such noises btw. vibrations with the MK4S.
In the end it was a loose cover from the lower bearings in the print head.

RE: Bad Vibrations

I want to emphasize that I don't mean to sound crass, but that just sounds like a printer to me. That is basically all just stepper noise. I don't hear the frame shaking or like a prominent resonance.