Runout Sensor for 2020 rails top mounted version (REMIX)

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5135748.

Remixed this so it can be mounted on the top bar of my Ender 3, since I have the spools of filament on a shelf above it (and using a direct drive mod).

This is based on my other remix with tighter tolerances for the roller switch: https://www.thingiverse.com/thing:5021688