Double Hand Crank Air Raid Siren
thingiverse
This is a manual air raid siren hand-cranked in 100 percent 3D printable form. Two rotors generate sound from opposite directions. It has yet to be 3D printed, as printing takes considerable time. Every component must be 3D printed twice except for two parts which may need minor adjustments before reprinting. Printing Settings Printer Brand MakerBot Printer MakerBot Replicator 2X Rafts Yes Supports Yes Notes You might need to increase infill density of rotor/flywheel so that it's heavier and capable of sustaining momentum for an extended period while still producing sound.
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