I agree to rules. question 1 . I think the the most useful thing I have seen online is using 3D to repair bones after they had previously not healed correctly. question 2, I would like to see our 3D machines use items to make things out of plastic that would be ordinarily be recycled or thrown away.We have too much trash in this world and we need to find ways to cut down on waste.I would like to be able to make baskets or other items with the 3D that I can use in my home.