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Siren Whistle, no supports — image 1
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Siren Whistle, no supports

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Building on the design ideas of other whistles, I'm seeing 105dB on my phone's meter.

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Model information

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Creative Commons — Attribution — Noncommercial

Prints well at 0.1-0.2mm, no supports required. 

Make sure the rotor is free from elephant-footing and can spin freely. 

A small dot of oil on the center shaft will help it run smoothly.

Quite loud and responsive, actually.

 

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