This can be used to attach a 4010 fan to a bullseye petsfang fan cooling duct.
The ideal would be to upgrade to a 5015 blower. However, in an effort to quiet my ender 3 I bought a package of dual ball bearing 4010 fans. I tested this in place of the stock ender 3 part cooling blower with the Petsfang Bulleye. I was surprised but I am getting similar or slightly better overhangs and bridges with a lot less noise.
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