Check out all or some of the following videos pertaining to 3-D Printing and/or do your own research on 3-D printing using the internet.
http://youtu.be/e0rYO5YI7kA
http://youtu.be/G0EJmBoLq-g
Write for five minutes minimum in your journal of the topic of 3-D printing and what you think about the future of 3-D printing. Does it sound too good to be true? What are some of the drawbacks? What will this mean for the job market of manufacturing?