Filament sensor with Ender endstop

thingiverse

I had trouble finding a filament runout sensor that utilized my Ender's endstops and fit bowden tubes on each side, so I came up with one myself. To make this work, you'll need an Ender endstop, some short pieces of 4mm bowden tubing, and two M3 screws. The screws should be the same ones used to hold the endstop in place; they will tap into the plastic easily. One very important thing to note is that if you want to use auto-unload when the sensor is triggered, you'll need to bend the metal arm so that it presses down on the button as the filament unloads. It's a good idea to test this setup before installing the sensor to ensure everything works correctly.