I have been using MKingCharles' tire leveling knobs for my i3 Mega for years and love them. However, eventually the knobs would slip down off the factory knobs they are press-fit on. This was just enough to not look straight and level, but not affect functionality at all.
I decided to remix the original to use M3 standoffs or nuts instead. There are three variations:
I currently use the standoff version with 6mm (5.94mm actual) x 13mm standoffs. I intentionally designed this to be a tight fit, so a clamp or bolt and washer may be needed to press / pull the standoff in. Longer or shorter standoffs can be used as the hex cutout goes all the way through.
The author remixed this model. Imported from Thingiverse.