CR-10 40 mm fan duct for original support
thingiverse
It's not flawless, but it functions with a 40 x 40 mm fan (10 or 20 mm). The setup includes two screws on top and either two or four 15 mm M3 screws to secure the fan in place. To minimize vibrations, some rubber or silicone is required to create a damper. If you experience any issues, feel free to let me know.
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