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The 3D printing of metal parts has been advancing, in medical implants, aircraft components, and aircraft engines. Even complex lattice structures are not unusual, as Within has demonstrated in titanium implants. Now engineers at UK-based building design firm Arup have come up with a design method for 3D printing structural steel elements to be used in construction projects. post 
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Interestingly, the curved lines of the first element, a steel node, resemble in a general way the "liquid lattice" structures Within designed for an automotive load-bearing engine block, using EOS's direct metal laser sintering (DMLS) process, as well as the turtle skeleton-inspired car body designed by the German firm EDAG Group. They are all beautiful art as well as elegant engineering design.