Noise gun. Spin that crank and hear the sound of anything but silence. Will upload printed version when i get the time to print it
Use the 100 mm version of the base part for a model fitting the rules of max 100mm requirement.
Noise level: max 102 dB(A) and average 86 dB.
Consider orienting the cog wheel such that the fibers are along the axis for better integrity of the build.