Ender 3 (Pro) Filament Runout Sensor using Z-Stop Switch
thingiverse
After installing a BLTouch I had a spare Z-Axis stop switch, so I made this thing to use it as a filament run-out sensor, also utilizing the factory screws. I didn't want it free-floating so I have it mounted to an existing screw on the Z rod. I set the run-out distance to 10mm in Marlin firmware so it prints until the filament leaves the run-out sensor to prevent it from pushing back under the arm of the switch and potentially damaging it.
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