E3D V6 Extruder Base for Geeetech i3 Pro C with metal X-carriage

I had to add a set of slots at the back of the extruder base to accommodate the screw heads for the bearing mounting straps on the metal X-carriage of the Geeetech i3 Pro C.

**Note**

I found a couple errors after installing, there are two additional screw head channels that need to be added to clearance the belt retainer and the X home switch bumper screws.

**Note 2**

I just discovered after making the above changes that the E3D nozzles sit ~1mm above the bottom of the X-carriage wi