We’re not sure if this should be classified as an art or a STEM project. The 3D Printed Marble Machine #3 by Tulio Laanen shows how you can can create both art and functionality at the same time and how you can easily print items that would be almost impossible to fabricate any other way.
Marble machines and similar projects are a great way to generate student interest and enthusiasm. Just to let you know, the track can take around 27 hours to print.