Mize DIY Wooden Motor Marble Run Automata Assembly Model Kits (Motor Operating S-Track with Toothed Wheel) Mechanical Puzzles for Kids & Kidults, Home Room Office Interior Decor

I bought a DIY Marble Run for myself and one to send my grandson. The parts are cut with precision and assemble very well. Be sure to dry assemble first and then come back with a small amount of glue in critical places. It is easy to assemble incorrectly at first, but then it becomes easier.