This is my filament runout sensor mount for my FT-5. I have the 713maker ultralight carriage with an E3D Titan Aero extruder. I used a standard lever switch style endstop switch.
I'll post some photos when I get them taken.
This can be printed in nearly any orientation, however, I've gotten best results when printed with the filament guide tube vertical and the larger end on the build platform.