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The figure depicts the multi-jet fusion printing of specimens used to study the effect of changing build parameters on mechanical properties. At each layer, heat is applied to a surface with fusing agent (black) deposited atop fresh powder. A transparent build volume shows the temperature distribution (white-red color map) on the printed layer. Further details can be found in the article number 2100974 by Grace X. Gu and co-workers. For the image, we would like to credit: "Fabiola Leyva from HP Labs".
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Chen et al. (2022) studied this question.
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