Tape’n roll inertial microfluidics

•Inertial regime fluidics for 2D/3D structures: spiral, straight, squarel, helical, and double oriented 3D-spiral channels.•3D orthogonal double spiral microchannel design to achieve single line inertial focusing.•Versatile and rapid fabrication method for adjustable transformation of any planar layout to 3D geometries.•A computational approach to model particle trajectory in 3D geometries.•A fabrication method that can be adapted by many domains of microfluidics.