My Synology NAS was making too much noise from vibrations so I remixed a Bambu Lab vibration dampening foot to work with the large Synologies.
I printed in 95a TPU, but PETG could be a viable alternative as well if printed without the rib. I've included that model here as well.
Uses the same screws and washers from the stock feet. Fits my DS1618+, not sure what other models it works with.
Remixed from wbphelps model: https://www.printables.com/model/398065-bambu-x1-vibration-damping-foot