puzzle_v5

I made a fun modle of developmental game. It's an fifth version . It is very smooth.
Installation is shown in the picture.

Game Instructions:
1.The modle requires four colors of rollball and the quantities respectively are 8.
2.Shuffling the colors of rollball.
3.Using the sliding block to arrange the colors of rollball.

Enjoy it.
This model was printed using PLA. (fill in 10%，using a lower layer hight 0.2mm)