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A three-dimensional (3D)-printed true 3D microfluidic device with standard fluidic coupling. (A) The schematic illustration of the 3D-printed device showing the cross-section of the 3D helical channel. (B) The cross-section of the channel is trapezoid in shape. (C) The actual 3D helical microfluidic device. Reproduced from Ref. Lee et al.[27] with the permission granted under the creative common license.
