Ender 3 Hot End Cooling Duct for Noctua 40mm
thingiverse
This is a remix from superpotatofudge's [CR-10 40mm Stock Hot End Cooling Duct](https://www.thingiverse.com/thing:2160958). I redesigned the thing with radii that match the Noctua NF-A4x20 fan. Also replaced the original hot end attachment with one that screws to the original holes (you'll need longer screws). Redesigned the interior of the duct to my liking and gave 1mm tolerance between the thing and the hot end heatsink. This is a work-in-progress, as I haven't integrated a part cooling fan or guides for the hot end wires! The Noctua NF-A4x20 is one of the quietest fans I've found! Although I've been told the A4x10 is enough for this purpose, I chose to get the A4x20, because why not (haha). It does the job pretty well and is "dead silent". Get it here from [Amazon.com](https://amzn.to/3065Wxh) or from [Amazon.co.uk](https://amzn.to/3kHyViT)
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