Molecube
As Molecubes called Hod Lipson and Victor Zykov , Cornell University their attempt to make a robot to build, which reproduce themselves can.
The "snake" made of 10 centimeter cubes uses other cubes to make another snake out of them. Any other shape that can be assembled from cubes is also conceivable.
The cubes themselves consist of 2 rotatable halves, in one the microprocessor , which represents the intelligence behind the whole, in the other the motor for rotating the joint .
The individual cubes get their energy from the tabletop they are standing on. So far they have had no other function than to reproduce.
This is still a long way from the real reproduction of robots without outside help, but this experiment shows that reproduction can not only occur in biology and refutes the many statements that a robot is not able to reproduce itself.