I’m not at all a fan of 3D printers. But, in this case it is different.
First, because the incentive to design and build, then a kid can then play with the figurine that they like at that moment and, finally, because the child’s every whim can be satisfied by himself, without the need for their parents should spend more money on a whim that may last a couple of days and then be forgotten. In this case, if that happens, just simply recycle the material for use in a new creation.

This little printer is called Origo 3D and is now only a concept created by designers and Joris Peels and Artur Tchoukanov. Fingers up to them for the idea, hopefully one day it becomes a reality.
Here is the video of Origo 3D: