The rubber rings on my mx master have rotten away.
Decided to print a replacement to see if it's worth it.
Just print two (or three) of these, cut them in the middle and use a bit of super glue to fix them in place.

Printed mine using PETG, but it's probably best to print it using softer filaments.

Tested them for over a week. Doesn't feel as nice as the original rubber (R.I.P.), but definitely more pleasant than bare metal.

Prusa

Prusa Clone

No

No

0.15

20%

The ring should fit snugly into the groves.