This is a functional Model of Rubik's puzzle (created 1999, not on sale anymore). Details of the puzzle can be found in the internet. I made some modifications to guarantee a better moving of the balls.
N.B.: New Balls: The balls consist now of two parts - a 2/3-dome and 1/3-bolt. This makes shure that the balls can be printed really round. The balls must eventually be glued together.
#Rubik #Rubiks_Shells #Shells