Neptune4 AntiVibration Feet (slim)

The effectivness can be slightly enhanced by turning 2 of the 4 feet by 90° when placed under the original rubber feet. That way especially the Y-Axis motion is dampened slightly better. This type of design printed in PETg or PLA is still rigid enough to keep a cabinet moving. Only the high pitch resonance frequencies are decoupled from the Surface the printer is on.

i did print it in PETg/colorfabb nGen. 0.5 Layer width which results in exactly 2 lines for the arcs. Infill can be reduced to a minimum. You could even remove top and bottom surfaces if you like the open look