low cost hall based Filament Width Sensor V2
thingiverse
Principle of operation : two ss49e hall sensors work in tandem, temperature drift consistent across both sensors. No temperature compensation required. A frame on the sensor accommodates a dust filter. Used parts Two ss49e hall sensors https://aliexpress.com/wholesale?SearchText=ss49e One 5x2mm magnet https://aliexpress.com/wholesale?SearchText=5x2%20magnet Two bearing rollers, 4x8 mm (you can use the round part of a 4 mm drill rod) A spring from an automatic pen 15-16 mm long M3 screw and M3 nut Wires Sensors in the body are positioned on opposite sides. If you're using klipper firmware, no additional details are required. Sensor support has been added https://github.com/KevinOConnor/klipper/issues/2426 For calibration, two known diameters are needed. I use 1.5mm and 2 mm drill rods for 1.75 mm filament. Hall-based filament width sensor assembly https://youtu.be/TDO9tME8vp4 Klipper setup procedure https://3dua.info/topic/146-datchik-diametra/ For using on marlin, an additional arduino board from my previous thing is needed https://www.thingiverse.com/thing:3096289
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