DIY 3D Wooden Marble Run Puzzle Kit - Mechanical Model Building Set STEAM

Marble Run 3D Wooden Puzzle: Built it with 196 pieces and 8 steel marbles. With hand rolling crank, uses gears to move marbles up to the top where they roll down into different channels. Well-made 3D Wooden Puzzle: The 3D Wooden Puzzles are made of log materials.

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