: Use scissors to cut a small half-inch slit along the center of that fold.
: Use a piece of paper about 1 inch wide and 5 inches long (though exact size isn't crucial). Screamer Free Download
: If you have a 3D printer, you can download free "screamer" whistle files from sites like Thingiverse. : Use scissors to cut a small half-inch
: Hold the paper between your first two fingers. The flat "cross" of the T should rest against your fingertips, while the folded section with the slit sticks out between your fingers. : Hold the paper between your first two fingers
: Fold about half an inch of each end of the strip outward to form a "T" or bridge shape.
Making a paper "screamer" is a simple DIY project that uses air vibration to create a loud, high-pitched noise. No software download is required, as it only uses basic physical materials. How to Make a Paper Screamer