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Lawrence Livermore National Laboratory researchers (from left) Phil Depond, Nick Calta, Aiden Martin and Jenny Wang are part of a multi-lab team that has successfully designed, built and tested a portable diagnostic machine capable of probing inside metal parts as they’re being printed during the laser powder bed fusion process, a common metal 3D printing approach. The researchers hope the instrument will provide insights into the causes of defects in 3D printed parts. Photo by Julie Russell/LLNL