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For this task, you'll need the assembled hot end, the HE280 PCB Mount, 3 #4, 3/8" screws, 1 Barrel Fan Blocker, and 1 25mm fan.

Insert the hot end assembly into the HE280 PCB Mount so that the tab with "SeeMeCNC" on it is aligned with the cooling fan retaining clips (identified by the red arrows).

Install the cooling fan into the retaining clips, under the HE280 PCB. The fan blades should face away from the hot end, as shown.

Make sure that the power lead for the fan is in the upper right corner of the fan as indicated by the blue arrow.

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