Stl is not tailored for additive manufacturing because it generates large file sizes of topology optimized parts and lattice structures due to the large number of surfaces involved.
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Roberts' research focused specifically on the lattice structures with the aim of making a previously solid structure lighter and stiffer. Software designed lattices provide stiffness and light weight when they're not supposed to. Now you can print shapes that, while not traditional looking, might provide more strength using less materials.
The innovative lattice structures could be manufactured using additive manufacturing techniques.
However, the study did show that lattice designs can greatly reduce the weight and mass of a structure like a cubesat bus and that 3d printing can effectively. Some equate lattice in the metal am applications to super alloys / materials. This is a study in saving material. This interior structure is called infill, and the pattern and density of the infill is controlled by the software that prepares the part for printing.
