Filament Width DIameter Sensor hall based V2

Principle of operation : two ss49e hall sensors work in differential mode, temperature drift same for all sensor. Temperature compensation not needed. Frame on the sensor for the dust filter

Used parts
two ss49e hall sensors https://aliexpress.ru/wholesale?SearchText=ss49e
one 5x2mm magnet https://aliexpress.ru/wholesale?SearchText=5x2%20magnet
two bearing roller 4x8 mm (you can use round part of 4 mm drill rod)
Spring from automatic pen
15-16 mm long M3 screw and M3 nut
Wires

Sen