Octoprint filament sensor for Geeetech A10

If You have microswitch from old broken mouse just solder two wires (middle lead and one closer to the white switch lever) and put it in the smaller part. Then take wires thru the hole and screw to the holder part with two M3x10mm. Put assembly near extruder and screw with original M4 allen head screw at the bottom.
Put appropriate connector on the other wire end for RPi GPIO. On my RPi 3B I took physical pins 15 (BCM22 or GPIO.3) and 17. For me appropriate plugin was https://github.com/Moons