Optical filament runout sensor, hybrid, with PTFE guides

Here is my implementation of this great model & idea: https://www.thingiverse.com/thing:3035553

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##### Update 2023-07-10:
It still works, zero issues. Also works perfect in Klipper. I send only a single command via Klipper config and everything else is managed on Repetier-Server side:

[filament_switch_sensor filament_sensor]
pause_on_runout: False
runout_gcode:
RESPOND MSG="filamentOut"
switch_pin: ^PE5 # Z-min endstop S

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##### Update