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Effect of the aspect ratios of the microneedle on the 3D printing. Stereomicroscopic images of the microneedles with 1300 µm input height and 500 µm base at the aspect ratios of 2.6:1, 3.9:1, 5.2:1, and 6.5:1 (a). The dimensions of the input to output base and the tip diameter according to the aspect ratios (b) (n = 7, scale bar is 1.0 mm).
