Filament runout sensor

Filament runout sensor for 1.75mm filament, uses M6 bowden tube connectors, micro limit switch,and two M2x12mm screws and nuts, i put a bend in the arm of the switch to shorten it up and make better contact pressure against the filament, there is a chamfer on the inside of the outfeed to prevent the filament from getting cuaght up when feeding it through

Bowden tube fittings
https://smile.amazon.com/dp/B00WE1A3D2/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B00WE1A3D2

Micro switch
https://smile.am