Bi-Directional Filament Sensor

This is a bi-directional filament sensor that works from either side instead of just one direction only. One doesn't have to push the lever in order to load/unload when the printer has triggered filament runout routine as well as the printer should be able to push back the filament through this filament sensor again during unloading process

There are 2 model types, ball type and flat types, if you have metal ball bearing about 8mm in diameter, you may use this, ball end also included but from my test, it has friction when the filament tries to ram the printed ball end. Flat type has smooth path as the printing orientation of the small bits there. Flat type also works with metal ball bearing.