Conical Spiral

A simple yet highly eye-pleasing conical spiral designed for 0.5" (12.7 mm) steel bearings.

Project Details

Conical Spiral

This track features 3 full rotations where the marble descends gracefully. The geometry is designed so the ball gradually slows down as it reaches the bottom, thanks to the decreasing slope — creating a very satisfying visual effect.

Built-in Storage Case

Tired of losing your bearings? The center of the cone features a built-in reservoir. Once the marbles finish their run, they collect safely in the middle, and you can easily pour them out when you're done playing.

Ideas:

  • Physics: variable slope for a "gradual braking" effect.
  • Storage: integrated center pocket to keep your marbles from rolling off the table.
  • Aesthetics: minimalist conical design that looks great on a desk.