Fabian Gebhart shared his Lorentz Force experiment on Thingiverse:
Don’t you love it? Magnetism? Electronics? And 3d printing? In this project I combine all of them together to a little but spectacular do-it-yourself experiment. With just a few components and the 3d printed part you will be able to build your own Lorentz Force Experiment.
DIY Lorentz Force Experiment – [Link]