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Heavy VFA on a "no VFA" printer  

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Justin
(@justin-3)
Trusted Member
RE:

While I will need to run a few more test parts, I replaced the smooth idlers on the X and Y axis with genuine Gates 2GT toothed idlers and it seems to have almost completely eliminated the VFA along my Y axis.

After I run a few more sample prints, I will post back here with a list of all of the things I originally tried that didn't work. If for no other reason, it can give someone (or future us) a list of things to try when improving print quality.

If anyone else wants to try the same modification, I have uploaded a new model to Printables to accommodate the wider idlers (Prusa smooth idlers are 9mm wide whereas the genuine Gates 2GT toothed idlers are 10mm wide). Give it a try: https://www.printables.com/model/629728-mk4-idler-ends-for-toothed-idlers

Please note, you will definitely need to re-tension your belts after switching idlers since the radius around which the belt travels will have changed.

Publié : 28/10/2023 8:48 pm
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mmaj
 mmaj
(@mmaj)
Active Member
RE: Heavy VFA on a "no VFA" printer

Thanks Justin for sharing! I will give it a try. I just have to find them in some store in Europe.

Publié : 28/10/2023 9:05 pm
Boris
(@boris-3)
Membre
RE: Heavy VFA on a "no VFA" printer

So I had this issue on one of our MK4s as well and I think I mostly fixed it.

You have to loosen your belts (in my case only the Y axis had this weird belt ringing), don't tighten your belts more because this will make the issue even worse

Publié : 07/11/2023 6:07 am
Andrew
(@andrew-11)
New Member
RE: Heavy VFA on a "no VFA" printer

Had a similar issue.  First 2 with the smooth Y idler.  Second 2 with generic toothed idler.  Helped a lot for my issue. 

 

Publié : 10/11/2023 3:02 am
Shushuda
(@shushuda)
Estimable Member
Topic starter answered:
RE: Heavy VFA on a "no VFA" printer

While I'm happy you're getting your belt ripple issues fixed, these are NOT VFA. I had these issues as well once and they were fixed by replacing the pulley on the affected axis.

But VFA are something completely different, a lot more fine, thin, with very little space between the artefacts. And in case of MK4, not on pure X nor Y movements, only at angles. VFA are caused by motor resonance.

I don't want to be rude, but you're kind of overtaking a VFA-focused thread with a different issue.

Publié : 10/11/2023 6:46 pm
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