The Solar version pulse-moves 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!

Specifications:

•     Intermediate skill level – ages 12+
•     Soldering required
•     Basic hand tools required (Phillips screwdriver, craft knife, wood glue)
•     Soldering tools required
•     No batteries included (or needed – it’s solar powered!)
•     3 hour build time

Kit includes:

•     1 x Set of laser-cut wood parts
•     1 x GM3 Motor
•     1 x 37x66mm solar cell
•     SolarEngine circuit board & components
•     1 x GMW Motor mount
•     4 x 3/8″ steel marbles
•     Assembly hardware

See the GraviTrack Battery