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Insert the barrel fan blocker between the last two heat sink fins at the bottom of the hot end.

Install with the long leg of the blocker on the left (red arrow) and the short leg of the blocker on the right (blue arrow). You'll feel the blocker "snap" into place when it's properly seated.

Attach the PCB to the HE280 PCB Mount using three #4 x 3/8" screws as shown.

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