3D printed filter center tube

1. A filter center tube comprising:

a plurality of layers of solidified material including

a first layer with a first undulating strip of solidified material extending in a first predetermined direction; and

a second layer with a second undulating strip of solidified material extending in a second predetermined direction;

wherein the first layer is in contact with the second layer and the first predetermined direction is not parallel with the second predetermined direction, forming a plurality of pores therebetween, and the first undulating strip of solidified material has a trapezoidal pattern with a pair of non-parallel legs, and the second undulating strip of solidified material has a square pattern with a pair of parallel legs.

2. The filter center tube of claim 1 , wherein the first predetermined direction is perpendicular or tangential to the second predetermined direction.

3. The filter center tube of claim 2 wherein the trapezoidal pattern at least partially defines a plurality of pores each including a pore dimension that decreases in size along the second predetermined direction.

4. The filter center tube of claim 3 wherein the filter center tube defines a third predetermined direction and the pore dimension varies in size along the third predetermined direction.

5. The filter center tube of claim 2 wherein the filter center tube includes a cylindrical annular configuration defining an outer annular region and an inner annular region and the plurality of layers contact each other define a plurality of pores therebetween.