3D printers

from this article ive learned that 3D printers are used to print computer format on to an object. ive also learned they use a program called additive manufacturing for the past 25 years. The shares for 3D printers has doubled. in my opinion the article was very informative on how the printer is used and worked. what i didnt like how ever was the length of the article I feel like they could have shortened it. My question is how will they use 3D printers in the future will they expand theyre industry or will they invent a possible 4D printer?