Ender 3 upgrade fanduct might also fit Ender23Pro5CR10
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Ender 3 upgrade fanduct (might also fit Ender2/3Pro/5/CR10)

This mod dramatically improves the hotend performance of the Ender 3 The coldend will be cooled way better compared models ...

similar models —

Ender 3 upgrade fanduct (might also fit Ender2/3Pro/5/CR10) alternatives
Ender 3 Tool Holder
Pickle_Rick_1