A filtering body comprising a filtering net, in particular for a rotary separator, the filtering net comprising a plurality of cells, which are equal to one another and are defined by the replication of a base cell; - said base cell comprises at least one intermediate filament and a first and a second end filament (22b,22d), arranged on opposite sides of said intermediate filament; - said intermediate filament and said first and second end filaments (22b,22d) extend along respective longitudinal axes that are parallel; - by cross-sectioning said base cell with any plane orthogonal to said longitudinal axes and by joining, on said plane, the trace of each said longitudinal axis with the trace of the adjacent longitudinal axis by a respective straight line, the two straight lines (B,C) are incident at the trace of the longitudinal axis of the intermediate filament and form a first incidence angle of between 90° and 160°; - said base cell comprises at least one further filament arranged between said intermediate filament and said first end filament and parallel to said intermediate and end filaments (22a,22b,22c); the axis of said further filament having, on said plane, a trace aligned with the traces of the axes of said intermediate filament and of said end filament; characterized in that: - said base cell is replicated along two replication directions (F,G), which lie on said plane and are transversal; - the distances between said filaments, measured along said straight lines (B,C) on said plane, are equal to one another; said distances being comprised between 0.1 and 3 times the maximum dimension of the cross-section of said filaments; - when measuring the dimensions (D1,D2) of the cross-section of said filaments along any two directions which are orthogonal and lie on said plane, each of said dimensions (D1,D2) is comprised between 0.1 and 0.8 mm; - the filtering body is made by a layer by layer or additive manufacturing technique. - said base cell comprises at least one intermediate filament and a first and a second end filament (22b,22d), arranged on opposite sides of said intermediate filament; - said intermediate filament and said first and second end filaments (22b,22d) extend along respective longitudinal axes that are parallel; - by cross-sectioning said base cell with any plane orthogonal to said longitudinal axes and by joining, on said plane, the trace of each said longitudinal axis with the trace of the adjacent longitudinal axis by a respective straight line, the two straight lines (B,C) are incident at the trace of the longitudinal axis of the intermediate filament and form a first incidence angle of between 90° and 160°; - said base cell comprises at least one further filament arranged between said intermediate filament and said first end filament and parallel to said intermediate and end filaments (22a,22b,22c); the axis of said further filament having, on said plane, a trace aligned with the traces of the axes of said intermediate filament and of said end filament; - said base cell is replicated along two replication directions (F,G), which lie on said plane and are transversal; - the distances between said filaments, measured along said straight lines (B,C) on said plane, are equal to one another; said distances being comprised between 0.1 and 3 times the maximum dimension of the cross-section of said filaments; - when measuring the dimensions (D1,D2) of the cross-section of said filaments along any two directions which are orthogonal and lie on said plane, each of said dimensions (D1,D2) is comprised between 0.1 and 0.8 mm; - the filtering body is made by a layer by layer or additive manufacturing technique.