Extruder + Filament sensor

Modified **original ender 3** extruder
**ARM** M5 coupler. (optional)
Works with **original ender 3** endstops.

**BASE** M6 coupler.
Add PTFE tube to base.

Lid screw **not** needed lid is snap-fit. (M3)

***Not tested on a bowden system might get in the way with the leadscrew***

**This is a remix from 2 models**
*Filament sensor* https://www.thingiverse.com/thing:4629979
*Extruder Arm* https://www.thingiverse.com/thing:3059247