Loud and compact Whistle for your Keychain

News 2024-03-17:My newest whistle design, a Long Range Dog Whistle at 7,000 Hz. Please download here.News 2024-01-21:I designed an ultrasonic dog whistle with an even higher pitch of 23 kHz, which you can download here.Update 2023-02-15:I have also designed a gift and storage box for these 3 whistles, which you can find here.SummaryI needed a load and compact 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).And I added 2 more variants of this whistle:an even slimmer version with 4 mm thickness that fits in your wallet,a variant with a lower pitch.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.Please also check out my Steam Train Whistle and my Valentine Whistle: