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Vertical cylindrical channel fabrication, repeatability, and yield. (a) Top view of a designed 650 μm cylindrical channel. The measured diameter of the channel is 606 μm. (b) Actual (measured) cylindrical channel size as a function of the designed size. Successfully printed open channels (yield) as a function of the designed cylinder diameters. Error bars denote standard deviation based on measurement of four channels (300–450 μm holes) or eight channels (500–800 μm holes).
