The reality is that my second extruder is never used and only causes me problems when servicing and more mass to move. I love NeverDun design (http://www.thingiverse.com/thing:551916), it eliminates the second extruder using their space to add a cooling fan. It did not fit with my spring loaded extruder (http://www.thingiverse.com/thing:231310). I made a few modifications to suit my needs. Now it is simpler and easier to print. Print without supports on the .STL position. Use your fingernail for remove the support (contained on the .STL itself) This replace only the main body part from thing: http://www.thingiverse.com/thing:551916