The document is a primer on practical 3D printing presented by Shashi Jain. It discusses applications of 3D printing such as prototyping, finished goods, custom molds, visualization, and ideation. It also discusses common 3D printing materials like FDM thermoplastics, SLA resins, sintered ceramics and metals, zprint ceramics, and Mcor paper. The document reviews the digital design, repair, slicing, and post-processing tools used in the 3D printing workflow. Finally, it discusses 3D printing services and getting started with choosing tools, materials, and experimenting.