; Question: How can 3D printing change our lives? It can be either positive or negative impacts. Grading: To receive full credit for this discussion, you need to post (1) an answer of at least 188 words, and (3) three substantive responses of at least 58 words each to other students' threads. A substantive response is more than just saying you agree or disagree. Please explain why. Don't forget to include your reference. Submission: Post your answer by choosing the Discussion 3 and then choose Reply to create your original written post. Post a substantive response by choosing a post of your classmates and click Reply