Filament runout sensor
thingiverse
Simple Filament Runout Sensor Using an Endstop Micro Switch Materials: PTFE Tube (4mm OD) One M3 X 12mm Cap Screw One M3 Thin Nut End Stop Micro Switch, Such as This: https://www.ebay.com/itm/Microswitch-Limit-Switch-Lever-Arm-Subminiature-SPDT-RepRap-3D-Printer-Endstop/122012731836?_trkparms=aid%26111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D9cba8e622bfc4a3da997efedc6448706%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D122012731836%26itm%3D122012731836%26pg%3D2481888&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A5d36de6c-b626-11e9-bce4-74dbd180f24d%7Cparentrq%3A58fe331516c0ad31a399b940ffe0ce39%7Ciid%3A1
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