Quick and dirty air raid siren that makes sound that can be heard from distance. Original idea and first design took about 20 minutes and print time was about 4 hours per part. New updated version has dual tone outer so it sounds little diffirent than original. Siren is designed over 2212 quadcopter motor (from crashed Cheerson CX-20) and is running really nice with 3S and 4S batteries. When running it longer time there is possibility that motor runs hot but i have not had that problem. In the bottom there is a 20mm round circles for attaching siren where ever you want, i designed and printed GoPro mount to attach siren in bottom of quadcopter camera mount to have remote controlled flying siren (because who doesn't need one?). When printing outer case we used supports but they are not really needed. We used about 40% infill but that is overkill and lower infill will do just fine, our siren is just extra rugged. We printed this with 0,3 mm resolution, but even lower resolution will do just fine. Prusa original 0.4 nozzle just don't allow us print bigger layer heights.
Please contact me If you have any ideas how to improve or redesign this siren, or even make it work better for your application.
Printed with some white noname PLA.