providing a linear additive manufacturing material supply by providing a stream of powder particles using a device that contains a first element that controls the flow rate of the stream of powder particles and a second element that controls the cross sectional area of the stream of powder particles;

using gravity to control the motion of the particles producing a linear stream of powder particles directed linearly straight downward by said gravity, wherein said linear stream of powder particles has a first side and a second side wherein said second side is diametrically opposite said first side;

directing a first ablation energetic beam from a first ablation energetic source to the first side of the linear stream of powder particles, and directing a second ablation energetic beam from a second ablation energetic source to the diametrically opposite second side of the linear stream of powder particles, so that the first and second ablation energetic beams remove oxidation and contamination from said linear additive manufacturing material supply;

directing one laser melting beam onto said first side of said linear stream of powder particles above laser substrate melting beam and directing another laser melting beam onto said second side of said linear stream of powder particles that is diametrically opposite said first side of said linear stream of powder particles melting said linear stream of powder particles above laser substrate melting beam forming a melted linear stream of powder; and

directing a laser substrate melting beam and said melted linear stream of powder particles to the substrate to produce the part.