This cooling rig dramatically increased my print quality. I can now print overhangs over 45 degrees cleanly and consistently. As you can see in the CFD simulation, the 3 air ducts channel the air exactly down the center. This maximizes the cooling of the printed section. This effect can clearly be felt on the actual printer. Installing the E3D V6 on the Rostock max is easy, but thanks to its compact design it's hard to fit a layer fan. I've tried about 10 different shroud designs, fans etcetera and found that either they didn't fit, or they would not blow in the right direction. Finally decided to design my own cooling rig. I've edited the layerfan shroud design by dreyfusduke to fit the E3D V6 with the effector plate either inverted or normal. It cools the prints instantly, maximum fan setting should not exceed 70% or nozzle temperature will drop dramatically. The original part by dreyfusduke can be found here: http://www.thingiverse.com/thing:614597Print the layer fan shroud 3 times in ABS. No screws or glue required, slides snugly on the effector plate mounting lips. Print settings: Printer: Rostock Max V2 Material: ABS black Nozzle: 0.4 mm Layer thickness: 0.25 mm Print speed: 40 mm/s Temperature: 220 C These parts were used: E3D V6 mount: http://repables.com/r/296/ (printed the pegs 4mm shorter than original) E3D V6 layer fan shroud by dreyfusduke: http://www.thingiverse.com/thing:614597 40x40x10 radial fans: http://www.aliexpress.com/item/5pcs-Black-Brushless-DC-Cooling-Blower-Fan-2-Wires-4010S-12V-0-15A-40x10mm/32314435053.html