Spring Loaded, Sound Absorbing Ultimaker Feet

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This part uses four remote-controlled car RC shock-absorbers as spring-loaded feet. The shocks are adjustable to account for the extra weight at the back of the printer. Otherwise, find the right size and don't worry about expensive ones. I used these: https://smile.amazon.co.uk/gp/product/B07GPSL8HM/ref=ppx . In my case, the top of the shock fit snugly into the hole in the top of the foot, holding it securely in place. There's room to put something through the hole at the end of the shock if necessary. The foot has a small hole on the inside to fit a grub screw and hold it in place on the printer. I didn't find this necessary as it grips well without it, but maybe over time the PLA will stretch a little and it'll become useful. Glue the top and bottom together (I used super-glue). Since the top is under stress, let the joint fully set before putting it into service. In terms of performance, I haven't made any careful measurements. What I can say is that the table the printer is on shakes less when printing a narrow section of infill, which tends to make the head move back and forth quickly over a short distance, causing a shaking effect. If you watch closely, you can see the springs absorbing that motion. The bottoms of the shocks could benefit from a foot or weight spreader. In such a case, some felt or rubber on the bottom of the foot would provide grip and possibly some additional sound isolation.