Filament sensor

this is a very simple and fast to print filament sensor,
you just need an end stop sensor, I used the one I had laying around from my tarantula 3d printer see picture and size.
and you need 2 m2 bolt with nuts, 20mm would do the trick.

Then just solder the 3 wires and all done. + left, - center and signal right.
maybe you need to experiment with the plus and -, just make sure the signal is correct.
you don't want to damage your board. wrong + and - connection will result in the computer