vibration damping printer feet (flex)

After using this a while it tended to topple over. I made an [other, completely different one what is also for flexible filament and hast also flexible strongness in (Slicer perimeters)](https://www.prusaprinters.org/de/prints/18196-anti-vibration-feet-flex-for-i3-mk3s)

story why I build damper for one of the most silent printers:
The Prusa i3 MK3 is pretty silent but my nighborhood sometimes is even more silent and gets disturbed if they can hear _any_thing. While infilling narrow parts the