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This whistle fights fascists | How thousands of 3D-printed whistles are derailing ICE.
(www.theverge.com)
This is a most excellent place for technology news and articles.
It's not going to be significantly unsafe. It'll shed more microplastics and is more likely to grow mold due to the surface texture, but if you're inhaling through the whistle you're using it very wrong.
That said, an injection molded whistle can be bought by the thousand for a few cents each.