Summary This is a remix of the excellent Thing N°547706 by Tech2C : http://www.thingiverse.com/thing:547706 PLEASE TAKE NOTE : There is a right and a left fan duct. There are two versions of the carriage, one is for the prusa i3 Hephestos and the other is a more generic one, choose wisely. Bill of materials : 1x E3D v6 hotend kit 2x 40mm fans 2x M3x16 screws 2x M3 nuts 2x M4x20 screws 2x M4 nuts Basically this is it, I wish you an amazing day printing this out and upgrading your prusa ! Post-Printing Inserting the nuts in the carriage The nuts needs to be inserted with heat into the plastic. You can use a soldering iron like this guy does. https://www.youtube.com/watch?v=dgTXkvOZQ0Y Why is there a white-bladed fan on the pictures ? I broke the blades of the original fan and was able to replace them with those http://www.thingiverse.com/thing:351835 Thank you loco !