A while back I shared a small safety whistle I designed from scratch and released into the public domain (CC0). It’s been printed, remixed, and distributed at scale thanks to feedback from this community.

**Penne 2.0** is the result of that real-world use.

What’s new:

* Reinforced lanyard area (top and bottom walls)
* Longer mouthpiece for more consistent airflow
* Improved first-layer reliability when printing many at once
* Reduced weight (\~1g) for easier bulk counting and distribution
* Cleaner plate groupings for batch printing (Bambu Handy can Skip sections if needed)

It remains **CC0 / Public Domain** — print it, remix it, sell it, or give it away. No attribution required.

Designed to be fast, durable, discreet, and easy to produce in quantity.

Turning quiet into the safety of sound.

Makerworld: [https://makerworld.com/en/models/2322874-penne-2-0-public-domain-safety-whistle-cc0#profileId-2536984](https://makerworld.com/en/models/2322874-penne-2-0-public-domain-safety-whistle-cc0#profileId-2536984)

Printables:  [https://www.printables.com/model/1576969-penne-20-public-domain-safety-whistle-cc0](https://www.printables.com/model/1576969-penne-20-public-domain-safety-whistle-cc0)

Yes, it looks like pasta.  
Yes, it also looks like… that.  
The humor is intentional. If it makes people smile *and* makes them safer, it’s doing its job.

Penne 2.0 – Public Domain (CC0) Safety Whistle, optimized for bulk printing