E3D v6 dual extrusion

had this idea a long time, wanted to add dual extrusion to my Kossel, didn't find anythign that fit for me.
made some iterations with different push-fit connectors which all didn't work for me, so I thought the original E3D connectors may work, and they did.
http://e3d-online.com/E3D-v6/Spares/Embedded-Bowden-Couplings-For-Metal-1.75mm-Filament

I used this http://www.thingiverse.com/thing:275593 extruder


I had to crank up the extruder acceleration quite a bit, it's just try and error