Train Style Air Horn
thingiverse
Wanted to make an air horn for my kids ride on truck similar to a train or large truck horn. designed to print without support and then bolt together with 1/4 20 bolts. use a few layers of 0.01~inch acrylic or metal (like the walls of an aluminum can) for the diaphragm. You will need to have an air tight seal between the resonator and the back cap. This thing is loud, like will scare people loud.
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