Cap'n Crunch Bo'sun Whistle

Ahoy mateys! The Cap'n Crunch Bo'sun whistle, originally a prize toy in boxes of cereal, became the stuff of legend as a tool for phone freaks (phreakers) delving the depths of telecom networks in the 1960s. Because it emitted a tone of 2600Hz, the same tone used by AT&T's system to signal a line to open and prepare for connection, it could be used to manipulate the system and make free calls. The 2600Hz signaling protocol is no longer in place, but phreakers' use of the whistle remains a touchstone of ingenuity in the history of hacking. Re-live the excitement with this 3D printed replica!

The fabled phreaker John Draper, who popularized use of the Cap'n Crunch whistle for network exploration, shows how he used to open a phone line and dial a number in this video: https://vimeo.com/112783389

Printing tips:

• Orient the whistle mouthpiece down
• Include a skirt starting 0.00mm from the object with 4 layers and 25 outlines
• Use 100% infill
• 0.01mm layer height
• Add external support only (Internal support will block air flow and the whistle won't work)
• Getting a perfect 2600Hz pitch is a challenge - scale your print to different sizes to
  tweak it up and down

This version is repaired and updated for the Carbon X1.