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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.
Why buy one when a superior one can be 3d printed? Hard to stop people from printing them. I've printed thousands over the years. I'm unfamiliar with the one shown in the article. The ones I print are very loud but probably take more time than those to print per unit.