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The 3D printed microneedle mold array measured by a stereomicroscope (a); the scale bar in the inset image and the bottom scale bar are 0.5 mm and 1.0 mm, respectively. SEM (b); scale bar is 0.5 mm. The microneedle mold array consisting of 7 × 7 microneedles was printed at the optimized condition with 60° printing angle to the x and y axes, 2.6:1 aspect ratio (input height 1300 µm, base 500 µm), and 1000 µm spacing between the microneedles.
