Here is one of my many designs

[Jeeplvr]

This one is acetone smoothed and ready to assemble. There's also some two color printing in there if you look closely.
The model is available on thingiverse here.
Its a chain drive or hand crank LED light. Other parts required are the Dynamo. LEDs, wire, #8 ball chain with 5lbs of weight if you plan to chain drive it.
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