Filament sensor
thingiverse
This item is detected if filament is end, conatcts is switch on. You need 2 spring 5-6mm, 9mm long 2 metal sphere from bearing 6mm 2 M3 bolts. Print it in 2 copyes. Connect wire to spring and insert it inside. put sphere at spring and connect two part of this gadget by M3 bolts
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