Exhibit 5: Close-up image of a 3D-printed skull showing the striations that the layers produce as they are deposited. These striations are found in all 3D-printed objects.

Source: Ruby J Chase; Gerald LaPorte, "The Next Generation of Crime Tools and Challenges: 3D Printing," December 3, 2017, nij.ojp.gov:
https://nij.ojp.gov/topics/articles/next-generation-crime-tools-and-challenges-3d-printing

From the article "The Next Generation of Crime Tools and Challenges: 3D Printing," December 3, 2017.

Exhibit 5: Close-up image of a 3D-printed skull showing the striations that the layers produce as they are deposited. These striations are found in all 3D-printed objects.