Ender 3 Pro Z-Stop Filament Runout Sensor Housing
thingiverse
Housing to repurpose a z-stop sensor as a Runout Filament sensor. I made a hole with the same diameter as a PTFE bowden tube so you can glue a short tube in the entry hole to prevent squeeking. For printing go as high in quality as you want. Infill minimum 20%. I used tree support when printing in the orientation as seen in the screenshot. Google for wiring intructions.
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