Universal Filament Runout Sensor

Filament runout sensor made with standard/off the shelf parts.
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Uses M2, M3, and M4 bolts for securing the pulley, switch, and bowden tube (optional).

Screws secure directly into the print in most locations, but use a nut on the switch adjustment, and pulley mount.

Bottom screw is for fine adjustment.

Can be used in Normally Open or Normally closed configuration. This can be configured with a battery and buzzer for audible use, or wired into a compatible control board.

###Pulley is the stock Ender 3 extruder idler.
Dimensions:
Depth: 3.9mm
Bore Diameter: 4mm
Inside Groove Pulley Diameter: 11.18mm
Outer Pulley Diameter: 13mm


###Switch PN:
D449-R1RA-G2
https://www.alliedelec.com/product/zf-electronics/d449-r1ra-g2/70371373/

Cherry D45C-R1RA (Pictured - Obsolete)

Possible Cross Reference:
Honeywell V7-1C17D8-201