This is a classic physics demonstration: a double cone that appears to roll upward on diverging rails.

Although it looks like it is moving against gravity, the center of mass is actually moving downward, making this a fascinating and counter-intuitive experiment.
It’s a great educational model for explaining center of mass, gravity, and geometry.

Features

• Designed for FDM 3D printing
• Simple and robust geometry
• Perfect for education, classrooms, and science demonstrations
• Eye-catching “impossible motion” effect