Demonstrating lighting speed 3D printing will inevitably get a lot of Youtube hits, but where does speed really matter? If you are able to make Eiffel tower miniatures at super fast rates, how would the entire logistics, inventory, distribution etc. compare to how a Chinese factory is already doing it?
I use this as demo example to demonstrate the clear challenge most companies in the 3D/AM space have, which is being able to come up with creative and truly business driven applications for their technology. If the applications were known, the demo parts would reflect that knowledge.