An integrally additively manufactured suction panel relies on printable micro-perforations for the suction skin, satisfying aerodynamic requirements for boundary layer suction such as area-equivalent perforation diameters below 250  \({\upmu }\textrm{m}\) and porosities of approximately 1%. This chapter uses two additive manufacturing technologies, stereolithography and selective laser melting, to manufacture porous sheet specimens designed for boundary layer suction. It characterises their geometry and pressure drop behaviour using microscopic image processing and flow bench measurements. State-of-the-art laser-drilled sheet and etched foil specimens were also characterised for comparison. This chapter shows the feasibility of additively manufactured porous sheets with area-equivalent perforation diameters below 250  \({\upmu }\textrm{m}\) , porosities of approximately 1% and pressure drop characteristics comparable to available etched and laser-drilled sheets. Further, the Preist coefficients are determined experimentally and allow modelling of the pressure drop behaviour of printed porous skin. The additively manufactured porous suction skin does not achieve the same perforation size and quality as the industrially available etched foils. However, in fulfilling the aerodynamic requirements, the porous sheets manufactured with stereolithography are ready for testing as a suction panel surface in wind tunnel experiments.