I’ve always used tilted fans pointing at the extruder, but wanted to get more precise with my cooling. This helps to improve the print quality because it can cool the PLA very quickly after it exits the nozzle. For my QU-BD extruders, I designed my first duct which used a 40mm fan and a very narrow chamber. Having the fan tilted at such an angle inhibited quite a bit of airflow. To remedy the situation, I ordered a blower (squirrel cage) type fan. I picked 4 of these up off of ebay. I’ve switched back to my MG nozzles because I have a lot of printing to get done for upcoming builds. I built two fan ducts. One of which blows directly on one side of the nozzle which is similar to what I have typically done, but a bit more focused. The second picture has a circular fan duct that I just designed. I still need to adapt the circular duct to the long duct, but that should not be much of an issue. I did a rudimentary test and am very impressed with the result. I can’t wait to try it out!
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