(Blower) 4020 to 4010 fan adapter
thingiverse
I only have 4020 fans and its quite difficult to find a fan duct for those, and I tried the HeroMe cooler but they seemed way to flimsy and open. This fits perfectly on <a href="https://www.thingiverse.com/thing:4897631">Schnabulation's Ender-7 Style fan duct</a>. I did test it on the default Ender 3 cooler and it also does work. IMPORTANT: When installing on <a href="https://www.thingiverse.com/thing:4897631">Schnabulation's Ender-7 Style fan duct</a>, make sure to fit the right fan before the hotend, since you have to run a screw from the inside, that's not a problem with the left one.
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