How to get rid of VFAs?
Hi,
I finished building my Core One+ a few weeks ago and in general it seems to work quite well. But on my models, I get these ripples on vertical walls, which I believe are VFAs.
What I've done so far:
- Built Core One+ from the kit
- Calibrated the belts, frequencies are within the suggested ranges (measured with both the app and the stroboscope feature), there is no gap on either side of the XY
- Phase stepping and input shaping calibration with the accelerometer
I printed this test object from Printables: https://www.printables.com/model/1189256-vfa-test-prusa-core-one and the top two sections of the print (190 and 200mm/s?) look ok (see photo below). So I think there is nothing fundamentally wrong with my printer. However, my own models have these obvious artifacts. Both shown below were printed with PLA with the 0.15mm balanced profile. As I understand it, the balanced profile uses 200mm/s for the outer walls so I would have thought the result is similar to the top sections of the test model from Printables.
I appreciate any help on this.
Mirko
RE: How to get rid of VFAs?
The spacing you see is the tooth pitch of the pulleys.
I'm going to install 1.5GT pulleys. The tooth density is slightly higher.
That's my next project as soon as the parts arrive. The G-code will need to be adjusted.
Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start
RE:
The spacing you see is the tooth pitch of the pulleys.
I'm going to install 1.5GT pulleys. The tooth density is slightly higher.
That's my next project as soon as the parts arrive. The G-code will need to be adjusted.
Just be aware Prusa have stated that the pitch of vfa’s does not match the tooth pitch of the belt or pulleys, which ties in with peoples results after swapping the belts with results being varied at best…some have reported no improvement whatsoever.
It seems a lot of work for what is basically anecdotal evidence.
RE: How to get rid of VFAs?
Agree with this. Have seen no concrete evidence that VFA are fixed by either toothed pulleys, switching to 1.5mm belts or both. From my understand the current workable fix is adjusting belt tension and print speed. Or switch to matte filaments.
Pretty much every CoreXY printer has VFA's to some extent.
RE: How to get rid of VFAs?
Should I try to increase belt tension above the recommended range?
Mirko
RE: How to get rid of VFAs?
possibly stating the obvious, but check the slow end of your calibration print. Most likely, the VFAS disappear so slowing down perimeters is one option to improve looks.