Loud and compact Whistle for your Keychain

**Please also check out my latest whistle designs:** **Very loud dual-tone whistle** I needed a compact and loud whistle to fit my keychain and couldn't find any design which fits my requirements. What I found was either too bulky, too fragile, or too quiet. So I made my own design, and this are the key advantages: - extremely loud for it's size, - very compact, only 5 mm thick, 14.3 mm wide and 48.9 mm long, - double tone, sounds similar to a referee's whistle, - easy to blow, - sturdy and hard to destroy, - lean design, - easy to print, - fast printing (< 20 min), little filament required (approx. 2.5 grams). **How to print:** Use a line width of 0.4 mm and a layer height of 0.2 mm, 4 top layers and 4 bottom layers. The whistle requires correct positioning of the Z-seam - it shouldn't be placed in the narrow air passages inside the whistle. The Z-seam should be positioned as shown in the image above (the white dots represent the Z-seam). Use the “Z Seam Alignment: User specified” option in Cura or the "Seam Painting" option in PrusaSlicer to achieve this. If you are using Cura I recommend V4.13.1 for this design as Cura 5.x still has problems placing the Z-seam. Print slowly to achieve sharp edges. If you want a multicolor print as in the picture above, change filament at the desired height. **Do you like it?** If you have printed this design and you like it, I would be happy if your make is uploaded.