Dynamor
thingiverse
This is a handheld device that harnesses the energy generated by dynamo power to produce electricity through movement of your arm or leg. You can see it in action on YouTube at youtu.be/g5CV1SXzBFs and youtu.be/8A3hK2MFjUA. You won't need any extra parts or equipment, the instructions are simple and straightforward.
Download Model from thingiverse
With this file you will be able to print Dynamor with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Dynamor.