I would want to build another and better 3d printer. Just because the ability for one machine to replicate itself is the beginning for other cool areas of science, such as machines that can repair and reproduce.
Anything is a lot of things to choose from! I think I’d print a spaceship! 😉
In terms of real things I might print I think I would print a model of Diamond. (One of my colleagues has already done this for part of Diamond. It looks really cool!)
I would build a scaled-down model of the laser system we are building – actually we are already thinking of doing it! 🙂 This would allow visitors to see the system from every angle and better understand its components.
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