Prusa i3 MK2 / MK2S Z-Axis vibration damper

When the z-height of my original Prusa i3 MK2S is about 30 mm, the threaded z-axis touches slightly the original (ABS printed) "Z-axis-top-part" and when these elements touch, they generate an irritating vibrating noise while printing. There are many comments on Thingiverse and on the Prusa forum stating that the threaded Z-axis should move freely, which also sounds logical to me.

So to overcome this irritating noise I made this damper which, when printed in a flexible filament, takes away th