RE:
The core one wasn't advertised as a "quiet" printer
Except in the launch video maybe? Try at 1:28...
RE:
And hey, even if it only reduces noise level, that's a story angle I can work 🙂
I'm just waiting for my all-in-one printer that can microwave popcorn. Or better yet, print the popcorn.
RE: Reason for Core One rumbling found (?)
The core one wasn't advertised as a "quiet" printer
Except in the launch video maybe? Try at 1:28...
I like the bit about "active chamber heater control" 🤣
RE:
I like the bit about "active chamber heater control" 🤣
"Active chamber temperature control". Which one can implement by controlling either the heater or the cooling fans... I think they had their lawyer review the script. 😏
RE: Reason for Core One rumbling found (?)
The core one wasn't advertised as a "quiet" printer
Except in the launch video maybe? Try at 1:28...
Well, there's that... but, admirably clever strategic omission, no word at all on doorhandle attachment life cycle.
RE:
Well, there's that... but, admirably clever strategic omission, no word at all on doorhandle attachment life cycle.
Or the feet... Which is roughly 5 seconds.
RE: Reason for Core One rumbling found (?)
It took a bit longer than expected but here we go - I uploaded the files with some info:
https://www.printables.com/model/1578733-linear-guiderails-upgrade-for-core-one
RE: Reason for Core One rumbling found (?)
Today, I tried to gradually counteract the resonance of several components.
The resonance was very audible during movements in the X-axis between 60 and 80 mm/s.
The more I tried to dampen it, the worse it became in the end compared to the beginning.
In between, I installed two alternative stepper motors from Stepperonline to perhaps achieve an improvement with phase stepping—no change.
Foam between the Nema and Nema holder or Nema holder and frame improved the situation around the source of the noise.
My conclusion after returning everything to its original state:
The excitation or source of why everything starts to vibrate is the Nema. Transmission via the pulley to the belt. The less vibration is transmitted to the frame, the more the belt gets. (my assumption)
In the end, the Nextruder hummed louder than at the beginning.
My personal guess about today's experiment: The phase stepping could be better and possibly eliminate the resonance.
Quick start printing for Prusa XL and Prusa Core One
Comfortable display working height on the Prusa Core One
Reducing metallic resonance noises on the Prusa Core One
RE: Reason for Core One rumbling found (?)
Today...
It took a bit longer than expected but here we go - I uploaded the files with some info:
https://www.printables.com/model/1578733-linear-guiderails-upgrade-for-core-one
I'm just curious, did anyone here attempt to replace the LM10LUU with something like a vesconite hilube 3d printer bearing? They're "self lubricating" (I guess impregnated with PTFE or something?) but primarily as they're plastic, the noise is reduced quite a bit, so I've read anyway. (We will see, don't expect an update from me anytime soon at the moment, have to verify everything is working out of the box as an upgrade. Waiting on replacement POM nuts too.
Noise is important to me because I live in a studio, I can't just plop my C1 in another room.
The only preparations I have done is to get a cement paver that I beautified with some fiberglass to level it & primed, painted, slapped some sorbothane feet on it and slapped some 3M PTFE film on the sorbothane feet bottom to help me slide it around for future maintenance. (untested as of yet).
What are your thoughts?
RE: Reason for Core One rumbling found (?)
My personal guess about today's experiment: The phase stepping could be better and possibly eliminate the resonance.
Yes, reducing the excitation source of the vibrations (uneven stepping) is definitely worth a try. I take it that you don't have the accelerometer yet but have ordered it?
The other approach worth looking into is to try and identify the "rattling" part, which amplifies the noise and makes it unpleasant by adding harmonics. If you can pinpoint it, you might be able to dampen it. As mentioned earlier, my prime suspect was a cover of the fan duct on the Nextruder.
On the other hand, Efto and hyiger have evidence that it might be the linear Y bearings -- that would be the more challenging noise source to deal with. I don't think you can damp them permanently (except by packing them with grease or replacing them entirely). But you might be able to confirm whether they are to blame, by damping them with your hands while the printer moves around?
RE:
Hello Jürgen. Thank you for your reply 🙂
I used the accelerometer several times yesterday because I restarted phase stepping after every change I made.
The differences were most noticeable when I installed the Nema 17 motor from Stepperonline without phase stepping and started printing—I've never heard a printer work so loudly. After phase stepping, the motor was “quiet” again.
I'm going to do something crazy today. I'm going to do a hard reset or factory reset and install the penultimate firmware (i.e., not 6.4.0) and test it again. As I already wrote, I suspect that firmware 6.4.0 does not measure and implement phase stepping correctly. My Prusa XL had similar problems.
I will only replace the bearings, which no longer have any balls in them, when I know there is no other way around it.
Yesterday, I placed my fingers or hand on parts of the housing to reduce the vibration in this area, with moderate success. In my opinion, most of the vibrations on the Nextruder come from the belt.
I will keep you updated.
Quick start printing for Prusa XL and Prusa Core One
Comfortable display working height on the Prusa Core One
Reducing metallic resonance noises on the Prusa Core One
RE: Reason for Core One rumbling found (?)
Ah, thanks -- I had overlooked that you already tried phase stepping. So compared to the Stepperonline motors you tried, the Prusa motors don't seem too bad regarding smooth stepping, even without calibrated microsteps. Which however will also mean that there is not that much to be gained via calibrated phase stepping.
The belts will definitely play a role in transmitting the vibrations, and maybe even amplifying them via a resonant oscillator made from the elastic belt + moving mass. But given the harsh sounds heard in the video in the Core One L thread, with lots of harmonics, it seems likely that some hard materials are colliding -- covers, bearing surfaces or such. (Assuming that your printer makes the same harsh resonance sounds, of course.)
RE: Reason for Core One rumbling found (?)
Yep, someone replaced the bearings with Vesconite: https://www.vesconite.com/self-aligning-3d-printer-bushings/
Today...
It took a bit longer than expected but here we go - I uploaded the files with some info:
https://www.printables.com/model/1578733-linear-guiderails-upgrade-for-core-one
I'm just curious, did anyone here attempt to replace the LM10LUU with something like a vesconite hilube 3d printer bearing? They're "self lubricating" (I guess impregnated with PTFE or something?) but primarily as they're plastic, the noise is reduced quite a bit, so I've read anyway. (We will see, don't expect an update from me anytime soon at the moment, have to verify everything is working out of the box as an upgrade. Waiting on replacement POM nuts too.
Noise is important to me because I live in a studio, I can't just plop my C1 in another room.
The only preparations I have done is to get a cement paver that I beautified with some fiberglass to level it & primed, painted, slapped some sorbothane feet on it and slapped some 3M PTFE film on the sorbothane feet bottom to help me slide it around for future maintenance. (untested as of yet).
What are your thoughts?
RISPONDI: Reason for Core One rumbling found (?)
Yep, someone replaced the bearings with Vesconite: https://www.vesconite.com/self-aligning-3d-printer-bushings/
Today...
It took a bit longer than expected but here we go - I uploaded the files with some info:
https://www.printables.com/model/1578733-linear-guiderails-upgrade-for-core-one
I'm just curious, did anyone here attempt to replace the LM10LUU with something like a vesconite hilube 3d printer bearing? They're "self lubricating" (I guess impregnated with PTFE or something?) but primarily as they're plastic, the noise is reduced quite a bit, so I've read anyway. (We will see, don't expect an update from me anytime soon at the moment, have to verify everything is working out of the box as an upgrade. Waiting on replacement POM nuts too.
Noise is important to me because I live in a studio, I can't just plop my C1 in another room.
The only preparations I have done is to get a cement paver that I beautified with some fiberglass to level it & primed, painted, slapped some sorbothane feet on it and slapped some 3M PTFE film on the sorbothane feet bottom to help me slide it around for future maintenance. (untested as of yet).
What are your thoughts?
Yeah, he used super lube inserts, which self correct, which I don't think is a good idea theoretically, hilube which is the plane white with no self correcting inserts is probably the way to go if you try this.
RE: Reason for Core One rumbling found (?)
Today, I reverted my firmware to the previous version 6.3.4.
The end results after input shaping and phase stepping were significantly better than with 6.4.0. (In my opinion). The noise hasn't gone away, but the rides have become smoother.
Of course, I now have to test this for a few days.The fact is that the noise has been reduced to a narrow speed range. From 60–80 mm/s to 75–80 mm/s.
I think I will test it with the linear rails.
Quick start printing for Prusa XL and Prusa Core One
Comfortable display working height on the Prusa Core One
Reducing metallic resonance noises on the Prusa Core One
RE: Reason for Core One rumbling found (?)
I would like to close my case here for now.
The noise has been fixed.
The linear bearings from the conversion kit have been removed and two plain bearings have been installed instead.
To my surprise, I am very happy with the result!
https://www.printables.com/model/1602328-prusa-core-one-resonance-noise-eliminated-with-sli
Quick start printing for Prusa XL and Prusa Core One
Comfortable display working height on the Prusa Core One
Reducing metallic resonance noises on the Prusa Core One
RE: Reason for Core One rumbling found (?)
The solution is certainly interesting, but here it is also a question of how the plastic bearings will behave at increased temperature in the chamber. I personally tested these bearings on the Y axis of my MK4S and the result was not very encouraging. At normal temperatures, it seemed to be loose on the rods, and when it warmed up from the pad, the friction between the bearing and the rod was so great that the motor was unable to move the Y axis. It would also be interesting to place two bearings in a row and simulate the original LM10LUU bearing. But that would require further research.
RE: Reason for Core One rumbling found (?)
I would like to close my case here for now.
The noise has been fixed.
The linear bearings from the conversion kit have been removed and two plain bearings have been installed instead.
To my surprise, I am very happy with the result!
https://www.printables.com/model/1602328-prusa-core-one-resonance-noise-eliminated-with-sli
That is very interesting! I do wonder if what could be causing the noise is some bending/misalignment in the rails and/or bearings? I been thinking about slightly unscrewing the rails, moving the printhead back and forward a bit and re-tightening them to see if that changes anything.
Replacing them with plastic makes it more tolerant to misalignment too.
RE: Reason for Core One rumbling found (?)
I substantially reduced noise doing the following:
- Removed the Y axis bearings and repacked the grease
- Left the linear rail bracket screws loose, moved the gantry in the Y direction across the full range several times and evenly tightened the screws
- Ran input shaper calibration - interesting that my X axis changed from 46hz MZV to 54hz ZVD
- Ran phase stepping calibration
My printer is now noticeably quieter. I think though it's the result of step 2. Before making this adjustment I measured a XY skew of -0.15° . So perhaps was caused by the gantry being slightly racked/bound.
RE: Reason for Core One rumbling found (?)
After re-tensioning the bracket screws as in step 2 above, the XY skew was reduced to -0.08° so almost half.