Robot cubes

[David Knaack]

These are really cool:

http://www.popsci.com/article/gadgets/robotic-cubes-stack-themselves?src=SOC&dom=tw

And they look like they'd be a fun 3D printing project.

For demo purposes several dummy cubes that are empty but have magnets on them could work with one RC controlled cube with a motor. Or you could make several that have motors, but use some buttons to control when and how hard it jumps.