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Hard PDMS molds engraved with circles with a diameter of 200 µm, at a laser power of 7.5 W and a laser speed of 0.254 m/s. (a) Photograph of the engraved molds. (b) Close-up view of the cavities of a mold engraved with circles with a pitch of 150 µm. (c) Close-up view of the cavities of a mold engraved with circles with a pitch of 200 µm.
