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Kits shipped after 2/24/2017 from SeeMeCNC come with a Barrel Fan Blocker (shown in first image). If your kit is from a prior date, you can print your own. Barrel Fan Blocker Install after initial assembly will not be an issue.

Locate the barrel fan blocker from your hot end kit.

Align the barrel fan blocker with the visible fin on the heat sink between the hot end stand off and the heater block. The blocker is not symmetrical, the side with the skinnier leg will be on the side of the heater cartridge leads.

Press the barrel fan blocker in until you feel it "snap" onto the heat sink.

This blocker will help to prevent any airflow from the barrel fan from making it down to the heater block.

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