CORE ONE vibrations  

especially if printing miniatures

No FDM printer is really suitable for printing miniatures; yes, you can do it but you are likely to be disappointed with the quality.  SLA (resin) printers are much better in that role.

Cheerio,

RE: CORE ONE vibrations

It does vibrate more than the Mk4S. I do see some VFAs. Overall quality though is quite good and I'm sure Prusa will dial it in more with firmware upgrades. My XL also vibrates a fair bit but print quality is excellent 

RE: CORE ONE vibrations

I had the same problem. The core one is very top heavy. My solution was to put it on the floor. I really want to find an affordable table that won’t shake all over the place.

RE: CORE ONE vibrations

I would recommend placing it on a floor tile.  Many of may printers it on a floor tile or concrete pad with silicone feet.  It helps absorb the vibration and reduce noise.  

RE: CORE ONE vibrations

Part of  the extra vibrations/noise issue is because of the Core One design. This printer, as well as the XL and others like the Voron Trident, features a gantry at the top ( on a fixed XY plane ) and a bed moving along the Z axis. The other Core XY design ( Voron 2.4 ) has a stationary bed at the bottom and a gantry moving up and down along the Z axis,

On the case of the XL Prusa had no choice, because of the interchangeable toolheads, the gantry frame must remain fixed on a XY plane at the top, but with the Core One they were free to choose either way. Both systems have pros and cons but, all considered, I firmly believe that on a single printhead machine, a stationary bed is the way to go.

RE: CORE ONE vibrations

I have a sturdy shelf for printers: a 3 cm thick solid wood board supported by three steel brackets, each rated for a 150 kg load, mounted approximately 50 cm apart on a concrete wall. However, the Core One printer vibrates too much at very high speeds. I solved this by placing the Core One on a 40 × 40 × 4 cm concrete tile, which sits on a foam mat on the same shelf. Any noticeable vibrations at high speeds have disappeared.

RE: CORE ONE vibrations

It vibrates a lot. I tried with a concrete tile underneath, it doesn't change much. But this happens with particular things, like the classic Benchy at maximum speed.

Maybe "silence mode"...? i'm tired today for more try 😀

RE: CORE ONE vibrations

I was wondering what "vibrations" actually means for the Core One. Is it mainly acoustic noise (potentially amplified by the enclosure panels)? Or patterns visible in the prints (VFAs)? Or does the printer visibly shake upon large excursions of the XY mechanism? All of the above? 🤨 

RE: CORE ONE vibrations

For me, just shake of the print. But I think it's quite normal with those speeds and that high center of gravity. Then I have an office table, rigid and beautiful but I recommend a four-legged table 😁

RE: CORE ONE vibrations

When printing for quality, I almost always slow down my Bambus, MK4S, Minis, and XL.  I can't imagine I would not do the same with the Core One.  Most new users have commented on vibration and noise.  I hope that will improve as they improve the firmware.  If not, I might enclose the enclosure.  

RE: CORE ONE vibrations

Posted by: @andytpks

For me, just shake of the print. But I think it's quite normal with those speeds and that high center of gravity. 

In a perfect world, that's what input shaping is meant to compensate for...

I would be curious how Prusa did the calibration of the input shaper, and how one does it at home with the optional accelerometer. With the accelerometer mounted to the print head, all it can see -- and hence compensate for via input shaping -- is overshoots and oscillations of the print head. But if the bed also vibrates (relative to the print head), that won't be measured and hence remains uncompensated.

It would be interesting to put two accelerometers on both, the print head and the bed, and use the difference signal from these to calibrate the input shaper, instead of just the print head accelerometer on its own.  I wonder whether there is an improvement in print quality to be gained from this. 

(If there were two distinct resonance frequencies, one caused by the head and a different one by the bed, both active during X and Y movement -- can the Klipper firmware even deal with that? Or is it limited to one characteristic resonance frequency per axis?)

RE: CORE ONE vibrations

After a good week of testing on a COREone:

The shaking is noticeable but not dramatic. We can see zero influence on print quality so far. We were planning to put the printer in an IKEA 'Bror' but that is a pretty leightweight steel construction (though having thick wooden platforms available) so we are reconsidering.

RE: CORE ONE vibrations

I added two legs to my table and the situation has improved significantly. The situation is not dramatic, far from it. Simply, in the same place where I had Mk4S and Mk3.5, the vibrations are of a different type

RE: CORE ONE vibrations

Following quite a few of the discussions that seem to have a similar thread regarding vibration/noise.

I also notice quite a few people eluding to modification to help with these issues. Is this normal for a new Prusa product and for people to be happy to begin to iron out issues themselves? 

RE: CORE ONE vibrations

Posted by: @scotttomo

Following quite a few of the discussions that seem to have a similar thread regarding vibration/noise.

I also notice quite a few people eluding to modification to help with these issues. Is this normal for a new Prusa product and for people to be happy to begin to iron out issues themselves? 

In a nutshell yes.  There always seem to be some issues when a new product is released, but Prusa always gets them fixed.  I'm not aware of a product that they haven't yet.  That's one of the great things about Prusa, they continue to improve the printers years after you buy them.  There's not another manufacturer in this space that does the same. 

RE: CORE ONE vibrations

It would be interesting to put two accelerometers on both, the print head and the bed, and use the difference signal from these to calibrate the input shaper, instead of just the print head accelerometer on its own.  I wonder whether there is an improvement in print quality to be gained from this. 

How is input shaping on the bed supposed to work with a Corexy printer?
Which motor do you want to use to compensate for the vibrations?
Of course it works with a bed slinger where the bed moves.
But it can't work with a fixed bed or a bed that only moves in Z.

I strongly recommend that you read the Klipper documentation about the function of Input Shaper.

RE: CORE ONE vibrations

Posted by: @rainer-2

How is input shaping on the bed supposed to work with a Corexy printer?
Which motor do you want to use to compensate for the vibrations?
Of course it works with a bed slinger where the bed moves.
But it can't work with a fixed bed or a bed that only moves in Z.

I strongly recommend that you read the Klipper documentation about the function of Input Shaper.

I think you are mistaken here. If the XY drive (due to its high position in the CoreXY arrangement) shakes the whole frame, it can also induce vibrations in the bed. These vibrations may be phase-shifted vs. the movement of the print head, and may exhibit a different resonance frequency than the print head.

These bed vibrations contribute to the relative displacement between print head and bed being different from what one would expect -- and hence they should ideally be corrected for by shaping the XY drive signals appropriately. Measuring both, the print head and bed movement, via accelerometers would provide the required information.

But I am afraid that the Klipper firmware can only account for (and compensate for) a single resonance frequency for X and another one for Y movements at this time. Hence, if the bed has a different resonance frequency than the print head, one is out of luck.