Self-defense Whistle Keychain - Pikachu

Want a self-defense keychain that's cute and doesn't scream “I could really hurt someone with this”? Then this keychain is for you.

After printing and looking at other self-defense keychains, they all seem to have one thing in common: giant eye holes to place your fingers in. Not only does that look suspicious, but in a real-world scenario, it adds a few seconds for you to locate and position your hand properly to use it. I intentionally removed the eye holes as you can simply grab around the keychain while still having enough protrusion to get someone to back off.

In addition, the lack of holes means I have enough solid surface to add an emergency whistle, which will come in handy if you want to call for help while you face your attacker.

Features:

• no ‘eye holes’ means quicker grip
• emergency whistle to call for help
• 90 degree angle between ears allows for two stab directions

Printing:

• print with 0.2mm layer heights (designed with this is mind for color changes)
• use 3 perimeter walls to get a better airtight whistle
• 20% or greater infill for strength
• printed with PLA but PETG should be fine:
  • Overture Black PLA
  • Overture Red PLA
  • random yellow PLA from a 12-pack assorted PLA for 3D pen

Tips on color changes:

• set a timer and don't wait too long to swap colors (because the color change happens far from the bed, you don't want the top black layer to cool too much as that will reduce adhesion
• on my printer, after a filament change, some filament starts running down the extruder, remove that right before you resume printing to keep the print clean