This securly fixes the rubber feet in place, once fitted into the profile the gub screws can be tightened to prevent the foot from moving or comming off. The part is quick and easy to print with no support material and mounting is made easy by the grub scew guide holes. I based this model on a ELCOM profile with 8mm slots as I do not own a PRUSA printer and I am not sur of the PRUSA profile dimensions but it is easy to modify for other profile dimensions.
HOW IT WORKS
The rubber foot is firstly fitted into the hole in the printed part and the 2 M3 grub screws are screwed in about 3 turns before clipping the holder into the underside of the PRUSA profile, once positioned the grub screws are tightened blocking the part in the profile by expanding in the slot like a raw plug.
Now no more feet falling of each time you move the printer.