Anycubic i3 Mega filament sensor

Replacement filament sensor enclosure for Anycubic i3 Mega.

Designed to be bolted to the outside of the right side of the printer where the z-limit switch is fastened.

I've used a shorter m3 nut and bolt to secure the sensor to the sensor case and a longer one to attach to the metal framework (Needs to be at least 16mm)

I think it works better in general than the original also.