NOVELTY - The method comprises placing a first mask having an aperture between a radiation source and a radiation-sensitive material, exposing the radiation-sensitive material to radiation beams to form a membrane support region with a porous radiation-cured structure and a fluid impermeable feed region circumscribing the membrane support region, and removing an uncured volume of the radiation-sensitive material from the membrane electrode assembly. The radiation-sensitive material is a liquid photomonomer or a solid radiation-sensitive polymer. The radiation beams include a first radiation beam.    USE - The method is useful for fabricating a membrane electrode assembly for a fuel cell (claimed) such as a polymer electrolyte membrane fuel cell that is useful as a clean, efficient and environmentally power source for electric vehicles.    ADVANTAGE - The method minimizes production waste, enables economic fabrication of the membrane electrode assembly with improved mechanical stability, facilitates the alignment of the electrolyte membrane and sub gasket within the fuel cell, and militates against the formation of stress risers within the fuel cell at the junction between the sub gasket and the electrolyte membrane.    DETAILED DESCRIPTION - The method comprises placing a first mask having an aperture between a radiation source and a radiation-sensitive material, exposing the radiation-sensitive material to radiation beams to form a membrane support region with a porous radiation-cured structure and a fluid impermeable feed region circumscribing the membrane support region, and removing an uncured volume of the radiation-sensitive material from the membrane electrode assembly. The radiation-sensitive material is a liquid photomonomer or a solid radiation-sensitive polymer. The radiation beams include a first radiation beam, a second radiation beam, and a third radiation beam directed from the radiation source toward the aperture to form first, second and third polymer truss elements respectively in a portion of a volume of the radiation-sensitive material. The first radiation beam is directed at a first angle with respect to the single plane, the second radiation beam is directed at a second angle with respect to the single plane, and the third radiation beam is directed at a third angle with respect to the single plane. The second angle is different from the first angle. The third angle is different from the first angle and the second angle. The first polymer truss element forms a fourth angle with respect to the single plane, where the fourth angle corresponds to the first angle. The second polymer truss element forms a fifth angle with respect to the single plane, where the fifth angle corresponds to the second angle. The third polymer truss element forms a sixth angle with respect to the single plane, where the sixth angle corresponds to the third angle. The first, second and third polymer truss elements intersect each other to form a microtruss structure. The aperture of the first mask provides a solid, planar sheet in the feed region with an inlet aperture and an outlet aperture. The radiation-cured structure of the membrane support region is caused to extend into the feed region. The method further comprises: placing a second mask between the radiation source and the radiation-sensitive material after the step of exposing the radiation-sensitive material to the radiation beams to form the porous radiation-cured structure, where the second mask has an aperture adjacent to the feed region; applying an ionomer to the membrane support region to form an electrolyte membrane; coating the faces of the electrolyte membrane with a catalyst ink; and drying the catalyst ink using an infrared drier to form a pair of electrodes (7) on the electrolyte membrane. The ionomer applying step seals the feed region.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic exploded view of a polymer electrolyte membrane fuel cell stack with a combined subgasket and membrane support.    Electrodes (7)    Unipolar end plates (14)    Active areas (16)    Gaskets (18)    Porous gas diffusion media. (20)