Optical Filament runout sensor for bowden bondtech bmg

Uses the optical sensor to detect filament.
require: 2x10mm M3 screw and 2xM3 Heated inserts

I design for the bowden bondtech bmg extruder. If mounting directly to 2020 extrusion then longer screws and might not require heated inserts.

NOTE: since this is a light sensor, this will only work with filament that is not transparent
Include the step file if you want to remix it