How is the new one, have you received it yet? We’re anxiously waiting on an update. 
Not good. My time was limited, so did not have time to test even more, but, i’m still with support on this. My 3rd printer (they replaced it twice, one came damaged) still shows VFA anywhere from 40mm/s to 140mm/s. And 140mm/s to 200mm/s is still there, just a bit more rare or spread, but clearly there. Mind you, i just finished 5 different tests, with line heights of 0.2mm and 0.12mm and different accelerations for travel, normal print and outer walls (2k, 4k, 10k).
It’s late here and i just finished and i can’t take a decent picture, so i’ll try to do that later. But at this point, i really don’t know what else to say except i’m disappointed. Something tells me i can’t be this unlucky to have received 3 bad printers. Ofc i know VFA is something normal with these machines, great. But the fact i have them at low speeds, like 60mm/s… makes me wonder. Nobody is realllllly talking a lot about the VFA, and everyone seems to be ok with the quality, so that’s that. And ofc, online, everyone posts their picture from the best angle, so no way to tell on most that VFA is there or not. But some you can tell 100%. Anyhow, i really don’t know what’s next… I might be looking for something that does not exist yet. Would love to have some $$$ to drop on R&D and find a damn solution to this problem. I can’t imagine me being the only one obsessed by this issue.
Many thanks for taking the time to reply, that’s very disappointing to hear. I was hoping you’d receive one of the good ones, but it doesn’t seem like you have.
I’ve noticed your post on the H2D forum and I’m hoping you get a reply with a positive outcome. This is where I’m leaning to as well, quiet err and better on vfa’s by all accounts.
1 Like
To op: I wanna say 2-400 hours is when I retightened belts. Belts after creation will stretch easily after moderate use, then remain near maximum stretch for the remainder of their life. When in doubt, run cleaner filament through, check for random filament bits stuck anywhere, retighten belts, regrease, recalibrate.
edit:
I also had vfa and ripples across different sections of layer 1 when I was using a filament that was mislabeled for speed max. Only after reducing speed did it print correctly. (think of the filament tearing as it’s laid vs oozing as it’s laid)
The other aspect to consider is if it’s crappy filament. Good through a few meters of the filament roll with calipers and measure diameter.
Printer has like 100 hours 
Third one…
Using only Bambu PLA Basic for testing.
40 is meh, 60 is bad, 80 is so and so, 100 and 120 is the worse (this is normal), 140 up to 200 is 10x better, but still there.
These tests done with:
- outer wall = inner wall speed
- accelerations: 10k, 4k, 2k
Not sure if anyone else wants to share their VFA test here, just to rule out that i’m crazy, but here’s the test VFA file that i used, edited from what Support gave me:
VFA_TEST_MODIFIED.3mf (27.6 KB)
I wanted to test finer layer height (0.12) and did 40 to 200, in 20mm/s increments. If anyone wants to share their results with me, pls do. Imho, 40 and 60 should be clean (or close to clean). everything till 140 can be so and so, understanding that 100 and 120 will be the worst. But low speeds can’t be bad imho and that is what i can’t accept. Their support sounds like broken AI at this point: increase speed, lower acceleration. Even though the test shows clearly that even at 2k acceleration, the VFA is still there 
Getting frustrated and not happy at all with the experience. Wasted sooooo much filament and time on this. Just can’t do it anymore.