This model can be used to demonstrate how the Lorentz force on a moving magnet inside a copper pipe slows down the fall quite heavily. I mad two versions: single and double pipe.

In addition to the 3d printed parts you’ll need a two (or one) copper pipe (Ø22mm × ~120cm), a neodymium ball magnet (ø15mm) and a steel ball (15mm).

Adapt this model at onshape.com.