Fan Muffler Silencer 40mm
Description
This is my attempt of a fan silencer/muffler. It's basically a Helmholtz Cavity type of silencer with an extra center cavity. The idea is to trap more noise with the extra cavity, but not sure if it's all that necessary since I havn't try the actually Helmholtz type silencers. But regardless, I was able to reduce around 6dB of noise. It was measured around 5cm away from the fan from all directions; the app then gives an average. In hope for a better result, I stuffed some sponge into the cavity which doesn't make much difference in the noise level, but reduced some weird resonance from the center piece. Then I thought, I am already stuffing sponge down the cavity (which defeats the whole purpose of the "noise trap"), why not make a duct silencer/muffler type of design. So that's my next plan. Note: printing it upside down with supports will probably give better finish. I know the design is not optimised for printing, but this is just a proof of concept so I didn't bother.
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