With this fascinating 3D marble run track from Wooden City 3D tinkerers dive into the world of engineering and construction. The set creates fascinating effects with steep descents, sharp bends and a funnel track. Continuous operation is ensured by a hand-operated elevator - the launched metal balls pass all obstacles on different tracks and rise back to the top. Includes 12 metal balls that move in sequence. 

Wooden mechanical 3D model - self-assembly requires no glue or tools