Design features: Print in Place 3D printed, inspired by the structure of engine pistons and cylinders
Operating principle: The reciprocating motion of the piston gradually pushes the marbles to a high point, then they roll down the track
Applicable marbles: Plastic marbles with a diameter of 1.2–1.4 cm Metal marbles easily fall off the track due to their large inertia
Operation method: It is recommended to keep the rotating handle at approximately 30 revolutions per minute to prevent marbles from falling back to the original step
Capacity design: Can hold and run 4 marbles simultaneously
Storage function: Marbles can be placed in the bottom tray when not in use

Printing features: Supports support-free printing, and offers a five-color version, suitable for H2C multi-color printers
Size adjustment: Can be scaled down to 90% of the original design