<p>The factory placement of the 25mm cooling fan right up against the heatsink results in only 2 of the 11 slots actually getting proper airflow. As a result my Ultimaker 2 would jam and stop printing after about 30 minutes of printing due to the hot end isolator and PTFE coupler getting far too hot.</p><p>This duct is held in place by the back two thumb screws and the fan can be screwed to the duct with either the two included screws or 4 5/16" 4-40 screws. You may need to trim away some black plastic from the hot end carrier to let the heater and thermometer wires clear without pinching.</p><p>I highly recommend putting thermal paste between the hot end isolator and the lower hot end carrier. Also between the lower hot end carrier and the heatsink itself.</p>
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