filament run-out sensor
thingiverse
Filament Run-out sensor using endstop micro switch for 1.75 mm filament Additional Materials: PTFE Tube Endstop Switch (such as this:) https://www.ebay.com/itm/Microswitch-Limit-Switch-Lever-Arm-Subminiature-SPDT-RepRap-3D-Printer-Endstop/122012731836?hash=item1c688689bc:g:PAcAAOSw9mFWK-Vl 1X M3 12 mm cap head screw 1X M3 thin Nut
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