Full of elaborate mechanisms and small tricks. The precise gear design, smooth transmission speed ratio. Each gimmick will create dozens of fun to watch. You can learn the fundamentals of engineering and structures of machines.
- a crane lifter as an elevator
- a wheel lifter to bring marbles to the top
- swingback rails, 2 straight rails, 2 curve rails
- a flip-flop as a switch to drive marbles to 2 paths
- a hand crank to move the whole system
Metal Ball, Plywood