Hemera Filament presence sensor
thingiverse
Filamrent Presence sensor for the E3d Hemera extruder. when adjustet corectly it should sense when there is filament between the drive gears i personally use it for my custom printer where it is used with the MMU2s i have converted to use on a duet wifi controller. other stuff required 2x 8x1.5 mm magnets 1x optical endstop https://www.banggood.com/5pcs-Optical-Endstop-Limit-Switch-Sensor-with-1M-3Pin-Cable-for-3D-Printer-p-1399211.html?rmmds=myorder&cur_warehouse=CN and a few M3 bolts.
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