This work outlines inexpensive patterning
methodologies to create open-air microﬂuidic paperbased devices. A phase-separation methodology was
used to obtain biomimetic superhydrophobic paper,
hierarchically composed by micro and nano topographies. Writing and printing are simple actions that can be used to pattern ﬂat superhydrophobic paper with more wettable channels. In particular, inkjet printing permits controlling the wettability of the surface by changing the darkness of the printed regions. The difference between capillary forces provides the possibility to control and drive liquid ﬂows through the open path lines, just by titling the piece of paper. Additionally, maintaining a continuous ﬂow, it is possible to direct the liquid at different volumetric rates in a horizontal position along non-linear channel paths printed/written over the surface.