GraviTrack Solar Marble Machine Kit

By Solarbotics
Not currently available

The GraviTrack is compact enough to fit on a desk top but large enough for easy mechanical assembly. The solar engine sends pulses to move the elegant hand-off mechanism that passes marbles to the top of a sweeping multi-level track. You will witness the fascinating step-by-step action of the arms as the geometry changes periodically. Patience is rewarded with the plunk, and rollll of a successful motion cycle. The more light it gets, the more often it moves. It's solar-powered stop-action motion! (GraviTrack is also available in a continuous-motion battery-powered version, which does not require soldering.)


  • Intermediate skill level - ages 12+
  • Soldering required
  • Soldering tools required
  • Basic hand tools required (Phillips screwdriver, craft knife, wood glue)
  • No batteries included (or needed - it’s solar powered!)
  • Estimated 3 hour build time
  • Size: 10 x 5 x 5.5 inches (250 x 127 x 140 mm)

Kit includes:

  • One Set of laser-cut wood parts
  • One GM3 Motor
  • One 37 x 66 mm solar cell
  • SolarEngine circuit board & components
  • One GMW Motor mount
  • Four 3/8" steel marbles
  • Assembly hardware

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