Marble Run V1

Due to the risk of accidental ingestion by children under three years old with 14mm ball bearings, this 25mm ball bearing track has been specially designed for 20-25mm ball bearings, which can be made of glass or solid plastic balls. For children, hands-on exploration is the greatest pleasure, so there is no electric version designed. Other versions will add electric versions in the future. The disc with text can be printed in two colors (print the text first, then print the disc), remember to s