3D Ball Maze
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This model requires an 11mm or 7/16" ball bearing available on Amazon and other online stores.
Insert the ball and see if you can get it through the maze, it is a 3D maze so you have to turn the cude in all directions including upside down at times.

Print as shown with base on print bed.
This print relys on bridgining but should be fine on most printers.
Print Time: 2h 18m
Filament: 36g
Supports: None
Brim: None