Doing some experimentation and testing, I found out that listing just the CFM of the fan is absolutely not enough. This document recommends using the CFM of 4-5, but this might not be enough depending on another parameter, and that is static pressure. The fan supplied with the E3D v6 is actually 6.50 CFM according to the specs (https://dcfan.en.alibaba.com/product/604...). I tried to use a fan which was 5.47 CFM (https://www.tme.eu/en/details/ha40201v4/...) as it was within the specs that this document listed. I found that the lower fins were hot to the touch (at least 50 °C). Then I found out about static pressure. The fan supplied with E3D v6 is 4.82 mmH2O, while I was using 2.03 mmH2O. As you can see, this is absolutely not enough. I found that the supplied fan cools at least 4x better. It would be nice if this guide could be updated with the correct specs AND the static pressure.
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