Ender 2 Fan Duct Axial
thingiverse
The cooling of my coldend was unfortunately a bit too weak in my tests. I am very pleased with this duct so far: https://www.thingiverse.com/thing:2751027 - - - A fan duct is designed to work with 40mm axial fans. I have plenty of airflow under the nozzle, even at just 50% fan speed. When the nozzle is heated to 190°C and the fan starts running at full speed, the temperature drops only 2°C. That's a small temperature drop, but it could be improved with PID adjustments, and that's okay for now.
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