Puzzle_v3(smooth version)

I made a fun modle of developmental game. It's an smooth version,

Game Instructions:
1.The modle requires two colors of rollball and the quantities respectively are 24.
2.Assemble it according to the pictures.
3.Shuffling the colors of rollball.
4.Using the sliding block to arrange the colors of rollball.

Enjoy it.
This model was printed using PLA. (fill in 5%-10%，using a lower layer hight 0.2mm，no support)