Housing for the 40mm Radial Fan
thingiverse
This housing fits perfectly with this fan: http://www.thingiverse.com/thing:6113. I installed a motor salvaged from a discarded HP Office Jet printer, and it runs flawlessly. Feel free to modify the SCAD files to accommodate your motor's unique layout and attach it securely to the backplane - there are various mounting options available. This design was originally intended for optimizing 3D print cooling, but I found its airflow performance to be a bit too potent - it managed to bring down my hotend's operating temperature from 200°C to a remarkably cooler 150°C.
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