See my MK2 version. http://www.thingiverse.com/thing:693572 MK1 info: I had made a simple air deflector (blue bit in pics) that fitted to the original fan housing of my D5S and it worked very well at stopping the temps dropping when the fan was on eliminating the need to insulate the hot end. I saw a new fan housing from ElBertie and printed it out as it centralized the fan to the nozzle. I immediately had temp drop problems so I fired up SolidWorks to create my own fan housing with deflector plate built in. So here it is it works very well and it stops the temps dropping and centralizes the nozzle.I printed this on my Wanhao D5S Mini with the following settings 50% infill 2 outer shells of 0.4mm No supports Custom marlin firmware. Simplify3d custom settings 0.2mm Layer height fast settings Time to print 104 mins