Summary This is a dual Fan duct that directly mounts were the original Fan mounted. My printer is a Reprap Prusa Sunhokey 2015 model. I have since replaced the extruder with a new clone that was slightly short the original. Finding a good dual fan duct that directed the air exactly were needed was a challenge. This Bracket and duct assembly is adjustable all 3 axis The bracket is mounted to the frame and can shift in the x direction. The ducts can be adjusted in both y and z axis to allow for precise direction of the air flow. Standard 40mm 12 V laptop fans were used. you will need two and wire them in parallel. After bolting them on I wrapped the fan ducts in foil tape to prevent them from sticking to the extruder if they were to jambed against a warped part. Print Settings Printer Brand: Prusa Printer: Prusa Clone Rafts: No Supports: No Resolution: 0.2 -0.3 Infill: 25% Notes: Printing with supports not recommended as its very hard to get them out after printing!