This is the version 2 cooling duct to be used with Reprap Huxley. The Huxley is very small and compact, this makes it quite hard to place cooling fans. This "Hose cooling" will take care of the cooling problem. You will need a strong fan/air pump. I use an air pump designed to inflate/deflate Inflatable Water Toys. The result is very good, I can now print up to 50mm bridges. :) The part is in two pieces to make printing and mounting/adjusting easier. You can find version 1 here: http://www.thingiverse.com/thing:281673