CR10S Pro OEM Fanduct ExtraMount
Free     Myminifactory     SkullKill

CR-10S Pro OEM Fanduct ExtraMount

This is basically the OEM Fanduct with the additional mounting holes i quite like the fanduct from siteswapjuggler with the additional mounting hole but looks like it is louder and feel like it provide less airflow and a bit too ...

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CR-10S Pro OEM Fanduct ExtraMount alternatives