The fan on part of my Ender 3 started making noise when it failed so I decided to replace it with one of these. First good news. . It was (basically, see btw, everything worked great. They're not as quiet as, say, Noctua, but they're noticeably quieter than OEM fans. There are a total of four fans in this kit: two axial (partially cooling) fans and two normal fans (which is also a board cooling fan) fans are nowhere near long enough had to splice a long enough cable to wiring from fans which i replaced kind of a pain but not a deal breaker.
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