What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?

I think architecture will profit from 3d-printing. it will open up a whole new dimension of forms to habitats. Can't wait to see all the new houses.

If you could build your dream 3D printer, what would it include and what would it do? Let your imagination run wild!

I'd be happy if it would actually work. If it uses recyclable materials that are truly bio degradable, materials that have the same properties, that we are used to today (strength, flexibility and food-safe). It would include feature-rich and reliable software that is easy to use.