Filament Runout Sensor 3mm

Filament Runout Sensor 3mm.

Required 3D printed parts:

• FilamentRunoutSensor_Case.stl (1x)
• FilamentRunoutSensor_Lid.stl (1x)

Required other parts:

• switch (1x)
• screw M3x12 (4x)
• nut M3 (2x)
• knurlnut M3 (2x)
• JST socket (2 pins, 2.54mm)

Remarks:

• The mounting holes of the switch have been drilled to a size of 3mm; this is not required if 2.5 mm screws are used.
• The PTFE tubes have been drilled out to 4 mm
• I did add a 4.7uF capacitor (to avoid false readings; this might not be required)
• The sensor can be mounted in two ways:

1. using the two tie rap holes
2. using the two 3mm screw holes

Some links to helpful Youtube videos from Chris Riley

Marlin:
https://www.youtube.com/watch?v=tl4VZ4zlxFQ

Klipper:
https://www.youtube.com/watch?v=gdVCC_2lnaY

For my own Klipper configuration, I have added extra functionality:

• at start of print job check if filament is detected.
• specify a specific position for the printhead if the "pause" command is called.
• add specific runout menu to lcd display (load filament,unload filament, resume print)
  (I can post those Klipper config files if required)