VFA Artifacts on X+Y Straight Edges - Hardware, firmware and software help

RE: VFA Artifacts on X+Y Straight Edges

Wario Man — Mon, 22 Sep 2025 16:01:32 +0000

Hello, first time user here with a core one kit on the way.

Looking at the VFA in the video didn't bother me, have been getting those for about half a year on my first printer (ad5m pro). Had no idea those were bad, the ones I get aren't terrible but really noticeable on shiny filament.

As for the belt fix, would upgrading to 1.5mm belts need new drivers?

I've seen mixed reviews on the VFA, with a lot of people stating perfect quality on their core ones and lots saying they have terrible issues. I haven't seen any reviews on the software update they released earlier this month to fix VFAs, has anyone here seen better results with this?

Thanks.

RE: VFA Artifacts on X+Y Straight Edges

gringo — Mon, 22 Sep 2025 07:04:10 +0000

What changes need to be made to the firmware and how?

RE: VFA Artifacts on X+Y Straight Edges

xzess — Fri, 19 Sep 2025 08:27:35 +0000

Posted by: @adaddison
Question, for those of you that upgraded to GT1.5 belts, what belt tension are you running on them?

Between 80Hz and 85Hz on both belt with the old method.
Works like a Charm. Almost no VFA.

RE: VFA Artifacts on X+Y Straight Edges

TeamD3dp — Fri, 19 Sep 2025 01:31:38 +0000

That wouldn't surprise me. I was calibrating some FR PC/ABS, and had slowed the MVF to 6, to try and improve quality. It had printed the ezPC beautifully, but needed some work with the FR blend. If I'm able to get the fan settings tuned and get the corner details looking right, I'll speed it back up. It does support the claim that a big piece of this belt ripple problem is connected to speed.

-J

RE: VFA Artifacts on X+Y Straight Edges

Jondoe — Thu, 18 Sep 2025 22:47:25 +0000

Posted by: @teamd3dp
Interesting discovery for me today while running a PA calibration on our Qidi Q2 at work...I see prominent belt ripple along the pure X movements. 🤔. Granted this isn't a VFA test, but so far I'd seen only very smooth walls from this printer.
-J

I think Qidi use speed exclusion zones in their slicer profiles to avoid belt ripple problem speeds - the PA test might have overridden that?

RE:

TeamD3dp — Thu, 18 Sep 2025 22:22:53 +0000

Interesting discovery for me today while running a PA calibration on our Qidi Q2 at work...I see prominent belt ripple along the pure X movements. 🤔. Granted this isn't a VFA test, but so far I'd seen only very smooth walls from this printer.

-J

RE: VFA Artifacts on X+Y Straight Edges

adaddison — Tue, 16 Sep 2025 04:34:47 +0000

Question, for those of you that upgraded to GT1.5 belts, what belt tension are you running on them?

RE: VFA Artifacts on X+Y Straight Edges

Ratlet — Thu, 04 Sep 2025 19:38:13 +0000

Ive got a print going after unblocking my hf nozzle (ran some cleaning filament through it and then some pla on a nylon heat).

Not op's box, but a gridfinity container all the same. Ive printed loads of gridfinity boxes in different filaments so should give a good idea of the new slicer settings effect.

RE: VFA Artifacts on X+Y Straight Edges

GBMaryland — Wed, 03 Sep 2025 13:13:23 +0000

Posted by: @baztm
People should stop using the VFA test tower. I found it was not representative of what I was seeing on real prints. Stick to real models and slicing

I really did it purely to see if the updated slicer using the 3M F file would actually any sort of different results.

I will say that the new slicer when slicing a real job actually screwed up the top layer on the print job… So I’m not entirely sure the new slicer is ready for prime time

RE:

TeamD3dp — Wed, 03 Sep 2025 13:04:09 +0000

Let's just see how confident (stubborn?) Prusa is in their software fixes when they release their next new printer. I maintain that they would be silly to use GT2 belts. From discussions here already, it seems that many agree that VFAs will still be present. What this means is that if they stick with GT2 belts for future printers and continue to have worse VFA's than Bambu, Qidi, and everyone else who changed spec to GT1.5 belts, it won't be good for them.

There very well may be specific build plate size/belt run correlations for where the various belt pitches resonate better/worse. Prusa has a different build plate size than most others, and it could be that the resonances of a GT2 belt are just a bit more reinforced due to the specific X and Y idler-idler distances on this printer at specific speeds. I can guarantee you that there are core one's at Prusa HQ that are testing GT1.5 belts, and if the results indicated no improvement it would have been stated clearly in these VFA posts.

-J