HI!
I’d like to share my unsuccessful tests to get rid of these VFAs on X axis.
I’ve changed the GT2 belt for a higher quality one (Gates Power Grip GT), it was a rather easy change, no need to remove sides panels at all.
I’ve tried a few different belt tension with this new belt, and didn’t obtain anything better than with the original old belt (~1600h prints).
So I think the original belt itself isn’t the root cause of the issue.
Following that, I’ve added motor dampers on X and Y motors, sadly without any improvement at all on the print quality.
Of course the calibrations have been redone on each and every change before the VFA test print in Orca.
I’ve tested with the tape around the pulley, it effectively reduce a bit the VFA, but on the other hand the print quality was worse than without, so I removed it.
I agree with other comments here that the non toothed pulley on toothed side of the belt isn’t the greatest idea Bambu had.
Strange choice, probably they is some logical reasons as the cost is the same.
I found these pulley who look like to have the same dimensions as the original one : https://fr.aliexpress.com/item/33023133633.html
I’ve ordered a few and also ordered a new full X axis on Bambu store (100€…).
Once I’ve received all the goods I’ll find a way to remove the original pulley and replace them with the toothed version.
Hope that with proper toothed pulley I’ll see an improvement.