In article, number 1901184 by Eric Wetzel and co-workers, a special thermal drawing process generates dual thermoplastic filaments with novel cross-sectional designs such as those pictured on the cover. These filaments are used to build 3D printed solids that, after a free-standing annealing process, achieve fracture toughness values competitive with injection molded plastics.
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Hart et al. (2020) studied this question.
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