Supplementary Figures: Design and characterization of a 3D-printed staggered herringbone mixer
Fig. S1 (A-D) SHM with design dimensions of w= 100 µm and d = 100 µm was characterized using the Keyence microscope. (A) and (B) are image outputs from the Keyence microscope and (C) and (D) show corresponding measured height traces at the location of the solid line in (A) and (B) respectively. Measured height profile demonstrates that herringbones are almost entirely fused together. (D) SHM with design dimensions of w= 100 µm and d = 300 µm. Measured height profile demonstrates herringbones that retained their distinct grooves; note that printed spacing between herringbones are approximately 220 µm, making them noticeably smaller than the design dimensions. This is a result of printer inaccuracies at smaller length scales and can be corrected through printer calibration (see Fig S2.) Panels (E-H) highlight common irregularities observed in printed channels patterned with herringbones. (E) and (F) are image outputs from the Keyence microscope and (G) and (H) show corresponding measured height traces at the location of the solid line in (E) and (F) respectively. These irregularities include missing portions of herringbones in (E), or additional smaller ridges present between herringbones in (F). These irregularities are highlighted with red bounding boxes in (G) and (H), and appear at random positions across prints.
Fig. S2 – Calibration curves enable accurate printing of heights and widths. To account for systematic deviations between the design dimensions and printed dimensions, a series of structures were designed, printed and measured. Upper panels represent calibration curves constructed for printed heights (left) and widths (right). In each panel, the input design dimensions are plotted versus the measured dimensions of the printed parts. A linear relationship was found and the data fitted to produce a calibration equation that enabled calculation of the design dimensions (‘inputs’) that would yield desired printed dimensions. The accuracy of this calibration procedure is shown in the lower panels. The design dimensions (‘inputs’, blue circles) and the actual printed dimensions (red squares) were plotted against the desired dimensions, for both the height and width. The dashed line in the lower panels represents the ideal case (where the measured and desired dimensions are equal).