My H3C did a motor vibration optimization pass on the Z axis, I wonder if the MC chopping code has some kind of endpoint bug in it. If I can replicate the sound I might try his test on a factory-reset machine that tuning has never been run on.
…because the nosie is there with new firmware on H2C and goes away COMPLETLEY on older firmware,
Also - bambu CONFIRMED this is an issue with the motor nosie compensation and there will be a fix, in the form of a firwmare and are advising peopple to “wait patiently”, and more recently I have seen that they are advising to revert firmware.
And its not handfull.
quite a few here
and here
Also some on reddit, one very recent here:
knocking started after FW update, went away after reverting
The only issue now is that Bambu has chosen to play stupid again. Because there is not older version of the FW to revert to on H3, they are acting as this is how its supposed to be, ignoring everything we (and they) know about H2 and the fact this is identical issue
Mind you - when this was first reported to them with my H2C, of course they started with the same exact resposne - NORMAL .
Took some doing to provide unrefutable evidence which they could no longer deny with straight face.
Every single H2 affected by this is “fixed” by reverting firmware. It goes away, completley.
The very same knock my H3C has now.
its not NORMAL. They are just trying to frame it as such and get away with it.
nothing to do with the file.
Its the spiral Z hops. Always. on every print.
H2D+Lead+Screw+Extended TEST.3mf (447.8 KB)
Six h machines is a good sample
I´m a litte confused right now. Does Bambu confirmed the knocking as not normal and bring a fix in future?
Yes they did on the H2’s
Because we can prove it to them its the firmware.
Flash new one starts knocking. Revert back - knocking goes away completely . They had no leg to stand on
Just to be clear: I’m not denying that the problem exists, but you have to respect my argument just as I respect yours: As things stand now, it’s only a handful of cases. If it affected a lot of customers, believe me, the forum and Reddit would be burning.
Snapmaker has, at least officially, stated in a community post and a wiki entry that this is normal; perhaps Bambu will also add to the wiki, too. The link has already been posted; I’ll include the community post as well. Snapmaker also offers a few practical ways to reduce it.
Under the current load and acceleration parameters, the Z motor generates an instantaneous reverse force during fast direction changes. This force is transmitted through the mechanical structure to the plastic base, producing a certain level of noise.
I’m sure Bambu will post a similar entry on her wiki soon. All in all, it really comes down to weighing whether to go for more speed or a quiet printer - in a nutshell. Printers are simply being pushed to their limits more and more in order to achieve higher speeds.
Maybe Bambu will make the necessary adjustments to the firmware to optimize the default selection between normal and silent modes.
Those who find it annoying can use silent mode, while the others can use normal mode.
I await the announced SUNLU sound proofing enclosure hood for Bambu printers and the accompanying 800 post thread about it that gets posts every day.
except, I just tried slowing everything down to absurd speed, and it is still knocking. Using Snapmakers suggested values makes no difference. Going into absurd slow unusable does, but does not elimite the knock.
Whereas the previoius firmware did not knock at all.
And they still promising they will fix this.
what I dont understrand is why does normal Z hop improve things ?
And indeed it does.Both on all H2’s affected, and my current H3.
Bed is moving the same way. So what gives ?