RE: VFA Artifacts on X+Y Straight Edges
Oil may result in loosening over time...
I'd be surprised if that happened. There's still the friction between the head of the tension screw and its seat in the tension pulley mounting block. A light machine oil is probably all it needs, but I'd be tempted to go for something a little thicker, say Prusa's bearing grease.
RE: VFA Artifacts on X+Y Straight Edges
Yeah, outside my expertise so just a hypothesis at this point. I still think it's undersized for the leverage against it, and that leverage may prevent slipping. I'm just concerned the lack of solids in oil or grease will be an issue over time.
I've not been noticing much vfa the last few prints, though not easy materials to see it I also don't feel it. No changes other than having to retension by ear a couple weeks ago (play a 170hz tone and tune to an octave lower). Also not using a high flow nozzle right now. I should try yhe new tool to see what belt tuning is right now.
Oil may result in loosening over time...
I'd be surprised if that happened. There's still the friction between the head of the tension screw and its seat in the tension pulley mounting block. A light machine oil is probably all it needs, but I'd be tempted to go for something a little thicker, say Prusa's bearing grease.
RE:
I have finished my Core One assembly yesterday (except for some panel work). The printer is completely stock at the moment. I have performed tuning (new method, accurate external mic on PC), phase stepping, input shaping. Now printed my first VFA test, with photos below. I don't think the VFA's are that bad. There are some narrow bands where the effect is more pronounced but there are definitely areas that are pretty much flawless.
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RE: VFA Artifacts on X+Y Straight Edges
So whats the solution?
RE: VFA Artifacts on X+Y Straight Edges
Print really fast….
RE: VFA Artifacts on X+Y Straight Edges
I'm following this thread with great interest. My printer, which started as an MK3S and is now heavilly modified - klipper, SKR Pico, linear rails, 10mm Z rods, Rapido 2, geared extruder and 0.9 degree motors from an MK4 - exhibits pretty much identical rippling as the affected Core Ones so the same problem can also manifest on a bed slinger it seems. I'm pretty sure that my Y motor is significantly louder than the X one so perhaps in the future I'll try replacing it. I hope that whatever the fix for the Core One will be maybe will also work for my machine.
RE:
Finished conversion mk4s to core one today, and the VFA problems are not very pleasing to hear...
on this video I learned that the VFA problem is caused by belt pitch being 2mm.
So to my understanding the best solution would be replacing the belts with 1,5mm pitch (and replacing the motor pulley to fit the new belts), since this is the core issue, as these 0.9 stepper motors shouldn't be prone to VFA.
Why do I feel they tell us now to increase belt tension, and later they will give new 1.5mm belts in core one upgrade...
RE: VFA Artifacts on X+Y Straight Edges
Why do I feel they tell us now to increase belt tension, and later they will give new 1.5mm belts in core one upgrade...
After running the phase stepper calibration and retuning the belts the VFAs seem (mostly) gone. I'm going to go off on a whimsy (make some wild guesses) but I expect the Core ONE S to: have a hinged top, replace the smooth rods and bearings with linear rails, switch to 1.5mm belts and include an accelerometer in the extruder, and what would be really cool is support for a second toolhead... but I digress.
RE: VFA Artifacts on X+Y Straight Edges
Regarding the VFA issue on the Prusa Core One, could the root cause simply be that the Core One is too rigid?
Regardless of the underlying reason, the problem seems to be that this 2 mm interval vibration is being transmitted all the way to the nozzle. Do you think that simply replacing the PCCF motor mounts, belt tensioners, and tensioner pulleys with ABS or ASA would be enough to absorb this vibration?
RE: VFA Artifacts on X+Y Straight Edges
I'm having the same issues. Tightening the belts to the new tension, and calibrating with the accelerometer has helped, but it's still there, just like it was on my MK4S. I'm running the latest firmware release (6.3.5 Alpha 10514) which seems to have fixed the excessive homing and nozzle cleaning failures I was having.
The VFA does have a 2mm pitch... I'm wondering if remixing the X-Y motor mounts to flip the belts over so that the smooth side rides in all all of the idlers might help. The only part touching the toothed side should be the pully on the motor.
I might put one of my kids on that this week.
RE: VFA Artifacts on X+Y Straight Edges
I'm an idiot. I just looked at it closely (my kids did most of the upgrade and I just went back to make sure everything was tight and connected properly) and didn't realize how the belts were run.
RE: VFA Artifacts on X+Y Straight Edges
I'm having the same issues. Tightening the belts to the new tension, and calibrating with the accelerometer has helped, but it's still there, just like it was on my MK4S. I'm running the latest firmware release (6.3.5 Alpha 10514) which seems to have fixed the excessive homing and nozzle cleaning failures I was having.
The VFA does have a 2mm pitch... I'm wondering if remixing the X-Y motor mounts to flip the belts over so that the smooth side rides in all all of the idlers might help. The only part touching the toothed side should be the pully on the motor.
I might put one of my kids on that this week.
Damn, I wish I could put my kid on that! Heh
RE: VFA Artifacts on X+Y Straight Edges
This is old. People on here and YouTube have tried the different belts, without much success.
RE: VFA Artifacts on X+Y Straight Edges
I did the conversion to the 1.5GT.
I printed a headphone holder twice. Exactly the same settings (perimeter, speed, temperatures, filament etc.).
Top with original belt. Bottom with the new 1.5GT belt and pulley.
And here it is turned around. 1.5GT on top and old belt on the bottom.
VFA tests look similar. Other prints have also improved dramatically.
Everything else, such as input shaping, phase stepping, and even Mellow 3D Pulleys (yes... i ordered 6 pieces...), did not help or improve anything.
RE: VFA Artifacts on X+Y Straight Edges
Theyve just released an update for prusaslicer which apparently massively reduces vfa.
https://github.com/prusa3d/PrusaSlicer/releases/tag/version_2.9.3-beta1
Beta version for the time being. Once installed you need to check for updated configs to get some new core one profiles. Note that at the time of me posting the profiles are only available of the high flow nozzle profiles (I think, only checked 0.4mm)
Also a blog post covering the battle against vfa:
https://blog.prusa3d.com/new-in-prusaslicer-consistent-surface-finish-and-nerfing-vfas_120400/
Ive queued up a gridfinity bin on the balanced profile. Not sure if I've done the filament before but it should hopefully give an idea.
RE: VFA Artifacts on X+Y Straight Edges
Seems from the tone they're basically stopping looking into VFAs now.
Be interesting to see some prints, I can't comment on the results yet, I will have a go on the beta tomorrow.
Interesting the point about VFA pitch not matching belts/teeth...and if that is the case (and they should know their stuff) Im glad I didn't mess about with belts/pulleys now.
RE: VFA Artifacts on X+Y Straight Edges
It did seem that the artifact smeared out at higher speeds.
Interesting how changing the belts is also producing better quality prints.
Tried a print but I think my SiC nozzle is struggling with the hi flow settings. Also pretty sure my hi flow nozzle has a partial clog. Ill need to see hownother people get on as I dont have time to troubleshoot my hardware issues.
RE: VFA Artifacts on X+Y Straight Edges
It did seem that the artifact smeared out at higher speeds.
Interesting how changing the belts is also producing better quality prints.
Tried a print but I think my SiC nozzle is struggling with the hi flow settings. Also pretty sure my hi flow nozzle has a partial clog. Ill need to see hownother people get on as I dont have time to troubleshoot my hardware issues.
I've got to dig around for some shiny filament. I mainly use filled or matte filaments and prints coming off my C1 have been looking sweet for quite a while now. I doubt I'll even notice improvements with those filaments.