Ender 3 Filament Runout Sensor Microswitch Holder
thingiverse
I needed a filament runout sensor that was as small as possible to fit between my filament guide and extruder. The microswitch I am using is https://www.amazon.com/dp/B00MFRMFS6/ref=cm_sw_em_r_mt_dp_U_7ySfEbZ968ZSQ I followed this guide for setting it up: https://www.youtube.com/watch?v=gwHpXaj_6xE&t=231s You can also wire it to OctoPrint (see the one I remixed for good instructions). I would suggest turning off any auto filament eject past a few mm as it can jam against the roller.
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