Fig. 2
Measurement of widths and heights of FDM printed micro channels. The printed test objects were compared with the CAD model to evaluate the achievable resolutions for poly (lactic acid) (PLA), poly (methyl methacrylate) (PMMA) and polycarbonate (PC). A CAD model of the test device. Dimensions are in mm. B Resolution of channel widths along the X-axis of the 3D printer. Dimensions are in µm. C Resolutions of channel width along the Y-axis of the 3D printer. Dimensions are in µm. D Resolution of channel height along the Z-axis of the 3D printer. Dimensions are in µm. Values are shown as mean ± SD of 3 devices, 3 measurements per device. Statistical significance was analyzed with Two-way ANOVA and Tukey post-hoc test (n s, not significant; *p < 0.05; **p < 0.01; ***p < 0.001)