
Ender 3 Filament Roller with Runout Sensor
thingiverse
Ender 3 filament roller guide with slots to attach a microswitch for a runout sensor and an out of filament LED I am using an octopi/octoprint If you are wiring directly into your 3d printer you will have to figure it out on your own (I apologize for the crudeness of my wiring diagram)
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