Extruder-Mount Filament Runout Sensor
thingiverse
A straightforward optical filament-runout sensor mounts securely between the extruder and its motor. I had previously used an optomechanical sensor and aimed to attach it directly over the extruder, but couldn't envision a way to do that without the filament getting tangled when the printer discharges it, so this optical sensor seems like a more suitable option.
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