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3D labyrinth for a ball bearing (12 mm or 0.5 inch) Just navigate the ball from the corner with the octagon holes to the spot next to it (with the hexagon hole). Insert the ball during printing !!
3D labyrinth
Order summary

3D labyrinth
Color:
Quantity:
Subtotal
$
Delivery (Jun 19 - Jun 21)
Free
Total
$