Filament sensor

This is a cheap filament sensor that can detect filament out or extrusion jam.
You need to choose the wheels with the clearance suitable for your printer.
Requires an optical endstop like this https://www.amazon.it/dp/B07CQWPLWB or this https://it.aliexpress.com/item/32602153500.html

https://www.youtube.com/watch?v=Te_O97aUcq0