Anet A6/A8 Optical Filament Runout Sensor

Remix of the sensor to hang on the Anet frame.

I used this optical sensors:

https://es.aliexpress.com/item/5pcs-Lot-CNC-3D-Printer-Optical-Endstop-Switch-RepRap-Makerbot-Prusa-RAMPS-1-4-Free-Shipping/32555619104.html?spm=2114.13010608.0.0.X15NHR

more info:

http://plugins.octoprint.org/plugins/filament_sensor_reloaded/