Ender 3 Direct Drive Extruder + Filament Runout Sensor + Dust Filter

Added a Dust Filter and a Filament Runout sensor to the direct drive mod.
I installed a BLTouch and I used the Z Limit Switch as a filament Rrunout sensor.

I bent the tip o the limit switch because it must accept filament to be fed in both directions... If a filament runout occurs the extruder will retract filament back to the limit switch...

The stock Ender 3 Limit Switch doesn't have a LED so I grabbed one that I had laying around and soldered it to the limit switch (along with its resistor).

The screws are nylon M3 with nylon nuts... I bought a bunch of them 15mm to 20mm then just cut them to the needed length.

11/01/2019 - Slightly modified the cover...