3d printed staged filtration media packs

A filter comprising:

• a housing including an outer wall and an inner wall, wherein the outer wall and the inner wall define the same longitudinal axis, the inner wall defines a radial direction that passes through the longitudinal axis and that is perpendicular thereto, and a circumferential direction that is tangential to the radial direction and perpendicular to the longitudinal axis, and the inner wall is spaced radially away from the outer wall, the housing further defining a first end and a second end disposed along the longitudinal axis and a hollow interior;
• an inlet in fluid communication with the hollow interior;
• an outlet in fluid communication with the hollow interior;
• and
• a filter medium disposed in the hollow interior comprising a plurality of layers, wherein each of the plurality of layers extends in a horizontal plane, and each of the plurality of layers includes an undulating strip of solidified material laid in a horizontal plane that also droops in a vertical direction.