BCN3D++B Single Bowden extruder

This is a remix of the DaniSaez Remix (http://www.thingiverse.com/thing:419278) of my BCN3D+ Bowden extruder (http://www.thingiverse.com/thing:406531). Thanks to the great job of Dani, he greatly reduced the carriage width, but he needed to relocate the fan in the front of it. As I like to see my parts printing (call me maniac...), I decided to redesign some parts to put the fan in the back as originally, and this is the result.
Dani found An other issue. How to attach the small 25mm cooler fa