In the past five years, personal fabrication has become a major research area in human-computer interaction (HCI), with many new contributions every year. In this article, I explain one of its core technologies, 3D printing, with the goal of helping interested researchers get started. For a survey and roadmap of open research directions, please refer to  and to the corresponding website (http://hcie.csail.mit.edu/fabpub/), which provides a list of all the research papers published in the field. Insights 3D Printing Technologies and Materials A common misconception is that 3D printing is limited to the plastic extrusion process seen…
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