cross-border new 3d gear rotating ball 3d printing toy 3d printed gear ball spin bal

gear rotating ball [blue and red]] gear rotating ball [red and gold]] gear rotating ball [blue and green]] gear rotating ball [red and black]] gear rotating ball [yellow green]] gear rotating ball [red, yellow and blue]] gear rotating ball [luminous green]] gear rotating ball [gold blue]] gear rotating ball [red, blue and green]] gear rotating ball [luminous blue]]

diameter 8cm (finished product) diameter 10cm (finished product)