This is my take on lazzymonk's vibration dampers, dimensioned to fit under a Prusa i3.
There are two versions. One standard sized, and one "mini" version for those that have a small enclosure or otherwise not enough clearance for the standard sized ones.
When you've decided which version to use, you need two of the STL files for each damper, and then 4x of that setup.
For example, for the standard size you need to print 4x of Half_18.STL and 4x of Half_22.STL.
If the printer shakes, common sense tells you that it's bad. But that only means that the vibrational energy is absorbed by the dampers instead of the printer's frame and its connecting components, which should in theory improve the printer quality.
But if you feel like the shaking is too much, then you can add this line to your slicer's starting script:
where 750 is acceleration in mm/s^2. This can be changed to whatever you like. Lower number means a slower acceleration.
And for everyone else who still want to remark on these feet affecting your print quality: https://www.instagram.com/p/BM7oaqoAPpk/
Make sure youre slicer is set to 0,40mm extrusion width, otherwise you will lose out on a lot of strength and stability.