RE: VFA Artifacts on X+Y Straight Edges
There's a thread on the bambulab forums where users are running a VFA test. It looks much improved over their X1C's but they're still there (at least for some) at some speeds. Obviously a matter of degrees and how much they bother you.
H2D has no vfa.
When I look at the test from Aurora tech, I think that the trash can print Vfa was visible.
RE: VFA Artifacts on X+Y Straight Edges
I’m always telling - in bambu VFA can be easy resolved - speed change in 80% cases, testing different accelerations and jerk settings in 20% cases.
In Prusa it is more complicated - currently based on my research I can see that Prusa steppers (in XL) doesnt like constant speeds - low jerk and low accels helps with VFA a little. Now I’m experimenting with micro fuzzy skin settings - so small changes that add 10%-15% of steps for each later (like you have 270 steps for layer, and after adding fuzzy skin you get 290-300). I’m running 1.0 nozzle with 0.32 x 1.65 mm extrusions, so that fuzzy skin cant do anything with the huge mass of flowing petg. First experiments gave me large sexy orange peel effect (known from bambulabs when you set wrong accels and jerk). And I think thats ok, but maybe I will get perfect walls after playing with jerk and accelerations.
There's a thread on the bambulab forums where users are running a VFA test. It looks much improved over their X1C's but they're still there (at least for some) at some speeds. Obviously a matter of degrees and how much they bother you.
H2D has no vfa.
When I look at the test from Aurora tech, I think that the trash can print Vfa was visible.
RE: VFA Artifacts on X+Y Straight Edges
yet you proceed to prove my point and show a thread where the H2D shows minimum VFA in comparison to both the Core One and the X1 and P1 series.
Unless you are blind, you can clearly see that the H2d is superior in every way.
BTW, you go around every single thread posting things that are not entirely true to plant the seed of doubt, just like you just did by posting a thread from bambu lab forum. Most fanboys will dissect it to prove their point, YET, the H2D is clearly superior to all machines currently for sale in the market today.
I have also seen you in reddit posting (you use the same profile pic but different name). Stop this fanboy behaviour. Hold prusa accountable and stop confusing future buyers with your posts.
H2D has no vfa.
All Core XY belt driven printers has VFAs. H2D has them pretty much the same as Core One: https://forum.bambulab.com/t/request-vfa-test/157362/14
RE: VFA Artifacts on X+Y Straight Edges
However, less VFA does not mean no VFA.
I only noticed it negatively in the Aurora Tech video.
When comparing the Robo Alpaca, the quality of Bambab H2D and Prusa XL was rated as equivalent.
Overall, I think the H2D has the better surface quality
I still don't want one.
As far as I know, Bambulab used a different belt.
Something like this could easily be upgraded to other printers.
RE: VFA Artifacts on X+Y Straight Edges
I also have a P1S, which has a lot of VFA, and yes, increasing speed makes it less visible, but then the print gets more matte, and matte shows less VFA and is less strong.
I just don't think increasing speed removes VFA.
Besides that, i sometimes want to print PETG, which is glossy, and then you see VFA.
It's true that some speeds show more VFA than others. On my P1S i have to avoid speed between 50 and 170, then i get less VFA.
RE: VFA Artifacts on X+Y Straight Edges
yet you proceed to prove my point and show a thread where the H2D shows minimum VFA in comparison to both the Core One and the X1 and P1 series.
Unless you are blind, you can clearly see that the H2d is superior in every way.
BTW, you go around every single thread posting things that are not entirely true to plant the seed of doubt, just like you just did by posting a thread from bambu lab forum. Most fanboys will dissect it to prove their point, YET, the H2D is clearly superior to all machines currently for sale in the market today.
I have also seen you in reddit posting (you use the same profile pic but different name). Stop this fanboy behaviour. Hold prusa accountable and stop confusing future buyers with your posts.
H2D has no vfa.
All Core XY belt driven printers has VFAs. H2D has them pretty much the same as Core One: https://forum.bambulab.com/t/request-vfa-test/157362/14
Your claims that H2D has no VFAs or that they are superior are not based on any evidence. Have you looked on those H2D VFAs images? They are pretty much the same as Core One has. They have slightly different pattern and look (it's very different machine), but they are pronounced at some speeds and gone on other speeds like they are on Core One.
Here are some shiny PETG examples of Core One VFA tests for speeds from 40 to 200 mm/s (from bottom to top):
And for 210 to 350 mm/s (from bottom to top):
If you want to have prints with straight lines without VFAs, you just have to print fast (200 mm/s and more) or avoid some specific speeds. And if you can't, you can use matte filament, lower nozzle temp to get matte surface on shiny filament, use light fuzzy skin, ... and maybe there are more options. But that's the same story with Bambu printers or any other belt based Core XY printers.
RE: VFA Artifacts on X+Y Straight Edges
H2D has no vfa.
All Core XY belt driven printers has VFAs. H2D has them pretty much the same as Core One: https://forum.bambulab.com/t/request-vfa-test/157362/14
That has not been my experience with Voron printers. While VFAs can exist, there is an entire wiki dedicated to finding out where the problem with your machine is and how to resolve or attenuate it. That prusa, bambulab, etc. have not figured out something the Voron guys figured out years ago is...concerning.
RE:
Interesting video by YGK3D on YouTube. His main gripe with the printer is about the VFAs, and was told by support to tune the belts to 105Hz which seem to have improved VFAs quite a bit…Is that what support are suggesting now? Has anyone tried this ?
He also has a moan about the complete lack of local streaming from the Core One camera, which is entirely fair.
RE:
I saw this one too.
I also have bad layer stacking as he describes at 14:52
I retuned my belts to around 102Hz, seems much better now regarding VFA's. I think 85Hz is a bit loose anyway, my Voron sits around 110Hz
I'm a bit disappointed in print quality my Core One delivers, i expected more from a prusa.
RE: VFA Artifacts on X+Y Straight Edges
I am giving this a shot now and printing the VFA test to see the results. I am at about 103hz on each belt now from 85 so I am curious to see if there will be any difference in the prints.
RE:
The top is 103hz belt and the bottom is 85hz. I don’t see anything that much better. Right is slowest speed left is fastest. Granted this is silk filament but I think it’s a good way to show it. I used this model for both tests. https://www.printables.com/model/1189256-vfa-test-prusa-core-one
RE: VFA Artifacts on X+Y Straight Edges
I am not sure if it was already discussed here, but I just did a quick visual check of my belts path, and it looks like the right motor pulley is a bit too low. The belt is rubbing on the top flange whatever the printhead position. Looking at the pictures from other users on the forum tends to confirm this.
The assembly manual does not provide a step to fine tune the pulley position, maybe the "assembly-multi-tool" spacer is a bit off.
I guess most of you already checked this, especially the kit owners, but can you guys confirm the pulley alignment, please? Thank you.
Same to me. There is a little gap between pulley ring and belt for both motors. But is it enough? Maybe this is the isue.
Right motor
Left motor:
RE: VFA Artifacts on X+Y Straight Edges
You have to watch the belt while it's running, because you'll see it run up and down the pulley depending where it's at in the travel.
As far as testing a toothed pulley now that Prusa have released the parts I have redesigned the core xy mounts to accept the gates toothed pulley. I will try it out when I receive the printer, although I don't expect it to make much if any difference since it didn't on my XL.
I suspect the issue has to do with motor tuning, both the xy motors and the extruder. I've seen that Prusa is aware of it, so we'll see what if any fix they come out with.
RE: VFA Artifacts on X+Y Straight Edges
Yes, they know about the VFA problem, they also told me about it in support. So hopefully they'll figure it out soon.
RE:
They will send me new belts.
Just sharing my journey:
They are sending me new feet. Though I don't believe for a second that it will help =)
RE: VFA Artifacts on X+Y Straight Edges
I have the new design feet and I gues VFA is not that bad as yours. PETG, 0.15 layer, structural.
I see little VFA only on this part (less than 1/4) of this piece:
But the rest it perfect without vfa...
RE: VFA Artifacts on X+Y Straight Edges
They are sending me new feet. Though I don't believe for a second that it will help =)
I really wonder why support continues to use this "grasping at straws" approach. It's been evident in various threads here where users shared the advice they received from support. Do they really assume that this might have an effect? Or have they been instructed to "just do something, anything" to string customers along?
RE: VFA Artifacts on X+Y Straight Edges
That's why I cut the last guy off by telling I tried literally everything they told me two or three times and I want to send the printer back in for repair.
If they are not able to fix it they can keep the printer
They are sending me new feet. Though I don't believe for a second that it will help =)
I really wonder why support continues to use this "grasping at straws" approach. It's been evident in various threads here where users shared the advice they received from support. Do they really assume that this might have an effect? Or have they been instructed to "just do something, anything" to string customers along?
RE: VFA Artifacts on X+Y Straight Edges
I think I will just return it for a refund before the 60 day return period expires. Better to buy a new one later - preferably with the new MMU system.