I had a cartridge of sealing silicone laying around. I figured they are quite the material you'd expect to absorb vibrations. So, I created this jig to create anti-vibration feet from a 44mm cylinder of cured silicone.
TBH, it turned out great. It grips pretty much any surface very nicely, and it is not very wobbly. I put a few slices under a PRUSA Marble™ and it has gotten even more quieter. I don't have any testing equipment so take this with a grain of salt.
You don't need any supports and you can use whichever material or config you'd like. For cutting you can use a good old box cutter and good amount of patience.
Also find the FreeCad doc to fiddle with dimensions.
The author marked this model as their own original creation.