Fig. 4From: 3D printing fabrication process for fine control of microneedle shapea The schematic diagram of 3D printed microneedle and PI microneedle. b The bevel angle of the microneedle according to the print angle. (α: printing angle, β: 3D printed microneedle bevel angle, γ: PI microneedle bevel angle) (n = 10)Back to article page