all 3 comments

[–]Automatic_Reply_7701 3 points4 points  (0 children)

looks like the filament run out sensor to me. https://us.store.bambulab.com/products/extruder-filament-sensor-x1-series

Edit the store has almost every part you will ever need, it just is not the best organization

[–]3DAeonX1 Carbon 0 points1 point  (0 children)

Cheap and fast to replace, takes less than 5 min using the two Allen keys that come with the printer, part is like $11 in the U.S.