Filament Motion Sensor Encoder

UPDATE: 13/07/2023
I recommend my new motion detector... https://www.thingiverse.com/thing:6114701

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New Filament Motion Sensor.

UPDATE: 14/09/2022
Added new encoder wheel.

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Currently setup and working on my Voron 2 using Klipper. Straight forward little optical encoder to detect filament motion or lack thereof and runout. Tried to keep it as small as possible compared to others out there.

Please refer to Klipper documentation for explaination of filament_sensor...
https://www.klipper3d.org/Config_Reference.html#filament-sensors

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Add to your printer.cfg (Klipper firmware) and adjust settings to suit your requirements...
[filament_motion_sensor my_sensor]
detection_length: 5.0
extruder: extruder
switch_pin: PG13 #adjust to suit mcu board being used.
pause_on_runout: True
event_delay: 5.0
pause_delay: 1.0

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BOM
2x M2.5x10mm SH screws
4x M3x25mm SHCS bolts
4x M3x10 or 12mm SHCS bolts (for mounting)
2x M3 hammer T nuts or spring T nuts (f