Cap'n Crunch Bo'sun Whistle

thingiverse

Ahoy mateys! The Cap'n Crunch Bo'sun Whistle, originally a coveted prize toy in boxes of cereal, became legendary as a tool for phone hackers (phreakers) exploring the depths of telecom networks in the 1960s. Its tone of 2600Hz, identical to the frequency used by AT&T's system to signal a line open and ready for connection, made it possible for phreakers to manipulate the system and make free calls. Although the 2600Hz signaling protocol is no longer in use, phreakers' ingenuity with the whistle remains a benchmark of hacking history. Experience the thrill again with this precision-crafted 3D printed replica! Compare the sounds of the original and printed whistles here: https://youtu.be/2qwcc3cKmsA The legendary phreaker John Draper, who popularized the use of the Cap'n Crunch whistle for network exploration, demonstrates how he used to open a phone line and dial a number in this video: https://vimeo.com/112783389 Printing Tips: - Align the whistle mouthpiece downwards - Include a skirt starting 0.00mm from the object with four layers and twenty-five outlines - Use one hundred percent infill - Add external support only (Internal support will block airflow and the whistle won't work) - If printing in ABS, smooth the whistle with acetone to achieve a great sound - Achieving a perfect 2600Hz pitch is a challenge - scale your print to various sizes to tweak it up and down Update: Andy Cohen, cohost of the 3D Printing Today podcast, kindly provided me with a revised version of the whistle mesh that resolves several issues with slicing. It's the best one to print.