Method and apparatus for additive manufacturing with powder material

A system for three dimensional printing with powder layers, the system comprising:

• a printing station configured to print a mask pattern on a building tray,
• a powder delivery station comprising a powder hopper configured to store powder material, and configured to apply a layer of powder material on the mask pattern,
• a spreading unit comprising a roller configured to spread the layer of powder material,
• a plurality of gutters which comprises a first pair of gutters actuated to move together with the roller during the spreading of the powder material and which is configured to collect excess powder material falling from edges of the building tray during spreading,
• a powder recirculation system configured to recirculate the excess powder material to the powder hopper, and
• a die compaction station for compacting the layer of powder material and the mask pattern.