Replace Hotend fan with noctua
exactly, only the original Prusa fan works fine for me.
Noctua are known for being quiet but not with the highest cooling power. Can anyone suggest a non-Noctua replacement that would be better than stock for cooling a Dragon, or is the stock heatsink fan sufficient?
It seems that Delta make the highest CFM fans in this size, and the stock fan is already the highest that Delta make. To get more, it would need to be a 20mm thick fan instead of a 10mm, which goes from 9.3 CFM to 10.1 CFM.
CUI make a 10mm fan with a higher throughput but it has a couple of questions over it. Firstly it needs ~240mA vs 110 for stock. Secondly, the 3 wire version has a yellow wire which i think is for a tacho rather than PWM, while the actual PWM model has 4 wires rather than the 3 that stock has. You can see them here https://www.cuidevices.com/product/thermal-management/dc-fans/axial-fans/cfm-40-series, the CFM-4010-03-20 and CFM-4010-03-22 are the 3 and 4 wire 5V models of interest.
I was thinking maybe one of those fans that populate 1RU servers and their power supplies, they usually have to push insane amount of air through. But they are thick (28 mm I believe) and BOY THEY ARE LOUD! And probably suck up more juice too, like that CUI fan.