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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.
Which STL do you prefer?
This is the one I used, it's quickish and prints well at 18 at a time. Figured it would be comfortable to hold.
https://www.printables.com/model/1493196-nice-whistle-1