on one plate Dual extruder CTC 3D printer

This extruder upgrade Require Support and works with V Groove Filament Guiding Bearing (3x12x4mm) as well as a normal flat Bearing (3x10x4mm)
-If (VERSION_1) works for you, there is no reason to make this one!!!
Here is the list of changes:
1)The pivoting arm was made even thinner at the top to make sure it will be compatible with all printer version (especially the ones with a cover on top of the extruder motors, like CTC printers, etc).
2) The v-groove gear now is easier to fit inside