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40mm Fan Velocity Stack with Gap — image 1

40mm Fan Velocity Stack with Gap

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I used a different fan with the original design and it made a high pitched whine, so this design has a 3 mm gap.

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This is a very minor change to cmh's design.  I just removed the 3 mm in front of the fan and it significantly reduced the noise.  It is still plenty strong.

 

I printed in PLA+ with supports on the inside only, and annealed the print in my countertop air fryer.  I left the supports on when I annealed it.  It still warped slightly, but is very usable.