Conical Spiral

19 Jan 2026 | by Marta

A simple yet highly eye-pleasing conical spiral designed for 0.5" (12.7 mm) steel bearings. ๐Ÿšโœจ

๐Ÿ› ๏ธ 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 slopeโ€”creating a very satisfying visual effect! ๐ŸŽ๏ธโžก๏ธ๐ŸŒ

๐Ÿ“ฅ Built-in Storage Case Tired of losing your bearings? The center of the cone features a built-in reservoir (container). Once the marbles finish their run, they collect safely in the middle. When you're done playing, you can easily pour them out! ๐Ÿ›ก๏ธ๐Ÿ’Ž

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.
2025