Filament sensor
thingiverse
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
Download Model from thingiverse
With this file you will be able to print Filament sensor with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Filament sensor.