Anycubic i3 Mega Custom extruder + Filament Sensor

####About
This thing is designed to replace the original metal extruder and printed filament sensor (optional) of Anycubic i3 Mega 3D printer


####Updates
+ 19.02.18 - Initial upload


####Main features
1. Doesn't require any additional screws, bearings, spacers, etc.
2. Provides easier filament insertion and replacement
3. Allows using additional bowden tube between extruder and filament spool together with filament sensor
4. Doesn't limit you on filament sensor cable length