tornado filament runout guide

this remix incorporates a filament guide and a run out inductive sensor, have been running this set up now for a few months now with no issues.
loading filament is easy the guide actually helps feed the filament .
you will need
2 x 698 zz or 2rs bearings
1 x inductive sensor NPN
1 x m3 nut and bolt
1 x 8mm steel ball