GraviTrack Battery Marble Machine Kit

By Solarbotics
Not currently available

The GraviTrack is desk-top compact but large enough for easy mechanical assembly. Elegant, swooping hands pass marbles to each other to the top of a sweeping multi-level track. A switched battery pack smoothly exercises the mechanism. The smooth pick/hand-off/place motion is hypnotic and enchanting. No soldering is necessary. (GraviTrack is also available in a solar-powered version, which does require soldering.)


  • Beginner skill level - ages 12+
  • Basic hand tools required (Phillips screwdriver, craft knife, wood glue)
  • 2 x AAA batteries required (not included)
  • Estimated 2 hour build time
  • Size: 10 x 5 x 5.5 inches (250 x 127 x 140 mm)
Kit includes:
  • 1 x Set of laser-cut wood parts
  • 1 x GM3 Motor + battery pack
  • 1 x GMW Motor mount
  • 4 x 3/8" steel marbles
  • Assembly hardware

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