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  1. 3D printing - Wikipedia

  2. What is 3D Printing / Additive Manufacturing? - 3DSourced

  3. Additive Manufacturing and 3D Printing - discoverengineering.org

  4. What is 3D printing? How does a 3D printer work? Learn 3D printing

  5. What Is Additive Manufacturing? - Built In

  6. What is 3D printing and what is additive manufacturing? - HP

  7. What is Additive Manufacturing? - MakerBot

  8. Stratasys - Industrial 3D Printing Manufacturers

  9. Additive Manufacturing for Innovative Design and Production

  10. What is Additive Manufacturing? - 3DPrint.com | The Voice of 3D ...