Exhibit 1. Printing Process of Fusion Deposition Modeling

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

Exhibit 1 illustrates the printing process of fusion deposition modeling. The material spool feeds filament into the extrusion head, which heats it to the melting temperature. The extrusion head pushes the molten material out as the head moves according to the patterns specified in the code file, laying down the material layer by layer. The material cools and solidifies to create the desired object.

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