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Here’s a great whistle 3D print file. I can confirm it’s loud as hell, and very easy and cheap to print in bulk. www.thingiverse.com/thing:2933021
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I stand behind my blocky boy remix of this file www.thingiverse.com/thing:7173152
I put together a version with the Monarca number on them. This whistle design works best and prints best in my experience: www.thingiverse.com/thing:7273282
Yes, you can print Aztec Death Whistles, and it rules makerworld.com/en/models/91...
3D printers can churn out an amazingly large number of whistles for very little money. bsky.app/profile/scoi...
They're roughly between 4-5 grams each, so to be conservative assume 200 per 1 kg roll if you're not switching colors. You can get cheap PLA for 11-13 bucks, so we're looking at 800-1000 whistles for $50
The Celtic Carnyx is also very metal and incredibly scary. youtu.be/jRIQp4qZrrE?...
These are probably faster, use less plastic, and are VERY loud: www.thingiverse.com/thing:3130078