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Narrow junction along printed microchannel relief features. (a) a CAD image for the junction connection. (b, c) Reproduction of the CAD image, printed with a solid-ink printer (Xerox 8550D Phaser) on a overhead transparency film. The molten wax ink spreads between the edges of the two lines to form a narrow junction connection. (d) Topography of a junction (reproduced from profilometry measurements). The scale bars for (a)–(c) correspond to 100 μm
