Method of manufacturing a single-piece column structure for the separation of a fluid medium

A method of manufacturing a separator element for obtaining molecular and/or particulate separation of a fluid medium for treatment into a filtrate and a retentate, the method comprising:

• implementing a single operation of an additive method of fabrication of a material to form a single-piece rigid structure that is uniform and continuous throughout, and without any bonds or exogenous additions,
• wherein the formed single-piece rigid structure comprises:
• at least two porous rigid columns having outer walls, said at least two porous rigid columns being made of a same material, and positioned side by side to define a volume for recovering the filtrate outside the outer walls;
• an inlet plate at a first end of the at least two porous rigid columns;
• and
• an outlet plate at a second end of the at least two porous rigid columns;
• wherein the inlet plate and the outlet plate are not separate parts fitted onto the at least two porous rigid columns;
• and
• wherein each column of the at least two porous rigid columns has an open structure, and each column comprises an inlet opening at the first end, and an outlet opening at the second end.