So I bought these for my Ender 3 and they certainly helped keep the noise down. Despite being a bit quieter than the stock Ender 3 fans and half the price of the Noctua fans, I still ordered the Noctua. One of the fans, I think the Hon mounted on the hot end has a subtle but annoying high wine. This noise improvement was not enough for me, and I ordered a Noctua with a step-down converter. If you're just looking for a plug and play Ender 3 fan replacement then use these, but if you're trying to make your printer as quiet as possible I wouldn't recommend them.
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