Sorbothane Mounting Foot - Bambu Labs X1C

The sound damping feet can be found here on the US Amazon:

1.25" Dia Sorbothane Hemisphere Rubber Bumper Non-Skid Feet with Adhesive (4, 50 Duro) https://a.co/d/fzzKBZe

Make sure to read the weight class suggestions from the manufacturer, my machine does not have the AMS unit on top, and I have not researched how much heavier that makes it. The next tier up is 70 Durometer.

These are squishier than bumpers for most products. I think that's the magic, striking the right balance is important, hence my note to review the weight recommendations.

I printed 4 of these in PLA and stuck the adhesive backed bumpers to the bottom. Then I popped them onto the feet. It's a slip fit. 

Vibration is noticeably reduced and took no time at all.