Filament Runout Sensor from enstop
thingiverse
This is a filament runout sensor basded on an endstop on a pcb. It is for 1.75mm filament. I recommend drilling ou the hole for the filament to 2mm to reduce the friction. Also you will need for better reliability 2 M3 16-18mm to hold the switch itself in place and close the sensor up. I used this endstop : https://de.aliexpress.com/item/32839158233.html?spm=a2g0o.productlist.0.0.6bbb61adE7E25R&algo_pvid=fe4e758b-dd85-4792-8f6b-16b040e2c1ba&algo_expid=fe4e758b-dd85-4792-8f6b-16b040e2c1ba-8&btsid=0ab6fa7b16003408805161413e665b&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ if u want to use the left winged version of this sensor just mirror it, it should fit.
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