Kingroon KP3S Pro fan duct for 4020 fan
thingiverse
The original Thing was for 4010 fan, if 4020 was used the printer can't homing X axis. Just adding 6mm to the brakets it's possible to house a wonderful Sunon fan achieved for 26db on 24v. So doesn't need voltage converter. Sunon MF40202V2-1000C-A99 DC 24V 0.68W You can also use Noctua NF-A4x20 FLX 12v adding a step down converter. But with the price of one Noctua you can buy two Sunon. Now the printer is silent (with dc-dc step down on PSU fan). And cooling is also efficient. The idea of hitoriblog was good, but not well implemented. For the duct of the blower I prefer the one made by HIRAMEte0r https://www.thingiverse.com/thing:5222192
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