Strong Greg's Extruder V2

**Updates**
***April 4th 2015***: Remove the hole for Hex nut because the nut was breaking the part when it twisted
**Summary:**
The great part with this extruder is that the filament is properly guided to the hobbed bolt.
I was fed up with standard Greg's extruder where i nearly needed to remove the pressure screws every time i wanted to change my filament.
With this system that question is obsolete as the filament is always properly guided from the dedicated top hole, to the bottom h