Also been running this exact setup (thanks for your post on printables!) and it has been working like a dream.
I installed the anti-vibration feet and then attempted to print a benchy in PETG… it was horrible. Lots of bad overhangs and alignment problems. It was a brand new spool of Bambu PETG so I thought maybe I needed to calibrate. I ran a resonance calibration and then filament calibration. I attempted to print another PETG benchy and again it was terrible. I ran the resonance calibration again and this time used the default Bambu PETG profile and again had a horrible print.
I then removed the anti-vibration feet and triggered a reprint directly from the printer and like magic I had a perfect benchy.
The items I will note is that the printer was on a super rigid and heavy surface and it was transferring it’s motion to the Ender 3 next to it, and I am sure the feet were firmly installed and sitting straight. I will say, they were very successful in reducing motion transfer from the Bambu to the Ender, but the printer then wobbled like crazy on top of the feet and the feet definitely was ruining my print quality with PETG. Interestingly it barely affected PLA, the PETG was far more sensitive to the motion.
I would try slowing the print speed to see if that helps. If it does you might need to play with acceleration/deceleration and see if you can come up with a happy mix of speed and those parameters.
Dampers must be matched to the vibrations. They should not be too soft. Otherwise the vibrations will cause the printer to sway and they will be amplified.
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