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The process of fabrication. (a) The 3D mold is printed by a commercial 3D printer. (b) Liquid PDMS is cast around the mold and cured in a heated oven. (c) The mold inside the PDMS block is dissolved by organic solvent. (d) Fabrication of a truly 3D PDMS microfluidic channel is finished after cleaning the channel with DI water.
