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Response surface plots for hardness: A) Hardness as a function of infill percentage (%) and layer height (mm) B) Hardness as a function of infill percentage (%) and print speed (mm/s) C) Hardness as a function of layer height (mm) and print speed (mm/s). Note that other textural properties (adhesiveness, cohesiveness, and springiness) are summarized in Supplementary Information (Figs. S3, S4, and S5).
