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 http://doi.wiley.com/10.1002/adem.202100974 by Grace X. Gu and co‐workers. For the image, we would like to credit: "Fabiola Leyva from HP Labs".
Multijet fusion (MJF) is a novel additive manufacturing (AM) process for the powder bed fusion of thermoplastic polymers. In recent years, MJF has been established as a promising manufacturing technique for the rapid prototyping and production of fully functional, large‐scale components at high resolution. Like other powder bed fusion techniques, MJF permits the printing of parts without support material, and does not require chemical postprocessing steps, making it especially suitable for fabricating parts with complex and intricate internal features. However, the effects of common build volume parameters (such as part orientation, location, and interpart spacing) on mechanical properties are currently not well understood. This study aims to provide a thorough and comprehensive description of the trends in mechanical properties observed in polyamide (PA)‐11 and PA‐12 samples printed using the MJF process. Tensile, flexural, and impact specimens are printed using varying build volume packing parameters and tested according to the corresponding ASTM standards. The fracture surfaces of tested specimens are studied and characterized to further understand the method of failure propagation through MJF‐printed PA‐11 and PA‐12. As this work demonstrates, determining an optimal bed packing algorithm will be instrumental for optimizing desired mechanical properties of printed parts.
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