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The new tensioning method didn't improve much for me (bottom one is with the new tension values). It has spread the VFAs to more speed ranges, although the higher speeds seem slightly cleaner. The only upside is that phase stepping calibration appears to work more reliable, although I still suspect that the measurements are distorted by vibrations not caused by the motors.
RE: VFA Artifacts on X+Y Straight Edges
What I'm trying to understand is how to you modify your printed objects in the slicer to use the speeds in the VFA test print to enable some VFA mitigation?
RE: VFA Artifacts on X+Y Straight Edges
So, is this new belt tuning method meant to be Prusa's solution for VFAs/belt ripple now? Jo Prusa had indicated in his Reddit post (a month or so ago?) that better adjustment would go a long way, according to their preliminary findings. Is there any current update from Prusa regarding VFAs and belt tension?
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So, is this new belt tuning method meant to be Prusa's solution for VFAs/belt ripple now? Jo Prusa had indicated in his Reddit post (a month or so ago?) that better adjustment would go a long way, according to their preliminary findings. Is there any current update from Prusa regarding VFAs and belt tension?
All the signs were there in that they released all this with no fanfare, no announcement even. I think they knew full well it makes little to no difference.
In some cases has made the problem even worse.😂
Conspiracy theory time: The cynic in me thinks they know exactly why this is occurring on some machines and not others...but the solution means taking a massive financial hit that they're not prepared to do. I also think they've likely fixed the problem at source, so no new printers will suffer...we're just the unlucky few (thousand).
RE: VFA Artifacts on X+Y Straight Edges
I used the accelerometer and it may have made a slight difference..
right now I’m in the process of trying to figure out how to print the higher speeds because the higher speeds are likely much much less with respect to VFA at the various angles
RE: VFA Artifacts on X+Y Straight Edges
What I'm trying to understand is how to you modify your printed objects in the slicer to use the speeds in the VFA test print to enable some VFA mitigation?
I don't think you really can, maybe someone can make a slicer module for it. I was fiddling with a script that goes through the gcode, decomposes the A/B angular velocities and bins then into acceptable ones. I think that this will be the solution Prusa ends up having to go with if they don't want to change out hardware but that requires calibrating it for each printer.
RE: VFA Artifacts on X+Y Straight Edges
I've read that Qidi have a user-configurable slicer option to avoid the speeds that cause belt ripple resonance. Their Plus4 seems to be well regarded with respect to VFAs.
RE: VFA Artifacts on X+Y Straight Edges
I've read that Qidi have a user-configurable slicer option to avoid the speeds that cause belt ripple resonance. Their Plus4 seems to be well regarded with respect to VFAs.
I’ve been thinking of picking up another printer just for giggles and I was looking at the Qidi 4 plus… also at the H2D… but none of the current printers aside from neat functionality are so much better than the core one that they’re a go to kind of thing.
The functionality on the H2 D pretty cool if you buy the fully loaded top-of-the-line one… But then you’re stuck with the Bamboo ecosystem…
And as you said, everybody’s got some VFA…. It’s really more matter of just how incredibly bad it is; my core one is not horrible.
RE: VFA Artifacts on X+Y Straight Edges
I also think they've likely fixed the problem at source, so no new printers will suffer...
I hope so, I'm still waiting for my replacement printer lol. Been about 3 weeks now, no one answers my emails, I have to ask chat support to get any "please wait more" answers... Ridculous.
RE: VFA Artifacts on X+Y Straight Edges
Whilst people are going to be furiously adjusting tensions, I highly recommend printing a couple of these to keep as spares (crucial if you only have access to one printer):
https://www.printables.com/model/1167816-core-one-printable-parts/files#preview.file.awl8f
Ideally print in PCCF, failing that any nylon or PC, failing that (like me) PETG-CF
If one fails you'll get the square nut spinning in the part, making you unable to adjust tension on that side, so unless you have access to another printer you won't be printing until you receive the spare part from Prusa. The only was I could remove the faulty idler was by destroying the PCCF part that houses it. (This is what Prusa support suggested also)
If one does fail pray it's the right hand side. The left one is tricky to get out due to the location of the door switch.
It can't be a particularly well designed part as I've already had one fail, others on here have also had the same problem, and reddit is flooded with users with the same problem.
Obviously if you only have access to PETG then only treat the part as temporary until Prusa ship you a new one.
RE: VFA Artifacts on X+Y Straight Edges
My bearings arrived, and I've assembled one of the 'silicone enhanced' idlers 🤣
I added a small shoulder for the bearing inner races to sit on, and I made a shorter piece of silicone tube so that there's some squish space.
The bearings are a really snug fit over the silicone tube, so there's definitely no 'slop'. Once installed in the idler holder the outer races both turn completely freely.
As soon as my CORE One finishes the current job I'll print a couple more flanges to make up a second pulley and then try them out.
RE: VFA Artifacts on X+Y Straight Edges
I see some people are discussing ticking in the linear rail. Mine developed a louder ticking around 400 hours and using the Prusa lube kit for the rail worked wonders. Operates very smoothly now.
Thanks for the info, can you also tell us the X-Axis distance from your printer statistics? Would be interesting!
I've read that Qidi have a user-configurable slicer option to avoid the speeds that cause belt ripple resonance. Their Plus4 seems to be well regarded with respect to VFAs.
You can set these things in Orca Slicer too. There are already some Core One profiles, but I only played around with a Nightly Build of Orca about 6 weeks ago.
Prints were worse due to non-optimised settings, but I tested the resonance avoidance settings and "don't slow down for outer walls" for a few smaller prints and the printer was definitely not hitting the resonance speeds as much as with Prusa Slicer, although slowing down layer times dynamically, not reaching the set speed before deceleration etc.
Also, the surface was nicer, since it always kept the full speed for the outside perimeters and instead slowed down more during Infill etc.
Sadly, retractions, seams, extrusion multiplier etc. would take quite some time to dial in and I didn't have that time available.
Definitely worth a deep dive! The only downsides I experienced were:
- only Prusa Link is working, not Prusa connect
- you can't see the "actual" speeds and flow rates after slicing, which I'm using to optimize surface quality quite a lot. I forgot if you could export the Orca G-Code and then see the "actual" values in Prusa's G-Code Viewer.
RE: VFA Artifacts on X+Y Straight Edges
Also, the surface was nicer, since it always kept the full speed for the outside perimeters and instead slowed down more during Infill etc.
The negatives you mentioned are why I'm hesitant to move away from PS, but PS is in desperate need of that feature IMO.
RE: VFA Artifacts on X+Y Straight Edges
Are you swapping just the front 2, Chris.
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Are you swapping just the front 2, Chris.
Yes. @Malpan showed some impressive results by just stuffing a bit of silicone behind the tension nut, so as I understand it the theory is that the belt system just needs a bit of compliance somewhere, anywhere, to damp the resonance.
EDIT: VFA tower is printing now.
RE: VFA Artifacts on X+Y Straight Edges
Are you swapping just the front 2, Chris.
Yes. @Malpan showed some impressive results by just stuffing a bit of silicone behind the tension nut, so as I understand it the theory is that the belt system just needs a bit of compliance somewhere, anywhere, to damp the resonance.
EDIT: VFA tower is printing now.
LIVESTREAM IT ! I wanna watch 😂
RE: VFA Artifacts on X+Y Straight Edges
LIVESTREAM IT ! I wanna watch 😂
Don't you have some wet paint you can watch dry? I find this a very frustrating print - it takes ages to get to the interesting bit because it starts so slow, and then you can only see one bit of it until it's completely finished and you remove it.
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Am I missing something? You can set all of your print speeds in the printer profile in PS.
RE: VFA Artifacts on X+Y Straight Edges
I did try that... but it doesn't seem to be as fast a the speeds listed in the VFA test. The VFA test goes up to 200% speed and the 150-160% speed seems to be where VFA is the least. ...but 150-160% of what?
RE: VFA Artifacts on X+Y Straight Edges
I ran a VFA test with the new settings. Same filament, same Gcode.
The worst filament I own. Glossy black PETG.
This filament had a really negative effect in real-life printing.
The new settings with follow-up phase stepping and input shaping were successful. But it's not a huge difference.
When I compare it with the red VFA test further back in the thread, mine wasn't that bad before either.
Up to 70 and from 170 onwards, it's pretty much VFA-free at all angles. On most sides, it was already like that before.
The worst side is the one at 60 degrees.
Overall, the surface is smoother, which surprised me.
I'm not entirely happy with the high belt tension, even though it's still below the recommended maximum radial force and was easy to tension.
Incidentally, the tension is still below the MK4 at 2.5 compared to 2.7.
I hope Prusa will soon offer settings in the slicer to better control the speeds.