An additive manufacturing system suitable for selective laser melting for applying a powder layer to a substrate, comprising a rotary manufacturing unit and at least a powder unit configured to store fresh powder, to apply a powder layer to the substrate, and to receive excess powder, wherein the rotary manufacturing unit comprises a first manufacturing chamber and a second manufacturing chamber, wherein the first manufacturing chamber comprises a first openable cover and the second manufacturing chamber comprises a second openable cover, wherein the first manufacturing chamber comprises a first doctor blade configured to apply a powder layer on a first substrate, wherein the second manufacturing chamber comprises a second doctor blade configured to apply a powder layer on a second substrate, wherein the first manufacturing chamber and the second manufacturing chamber comprises an opening formed in the bottom of the rotary manufacturing unit through which the powder unit can be engaged with the rotary manufacturing unit, wherein a manufacturing chamber bottom plate of each manufacturing chamber comprises a sealing interface configured to hermetically seal the powder unit to the manufacturing chamber, wherein the rotary manufacturing unit is configured to be rotatable into a first position in which the first manufacturing chamber is positioned for irradiating the powder layer on the first substrate and the second manufacturing chamber is positioned for enabling an opening of the second cover, and into a second position in which the second manufacturing chamber is positioned for irradiating the powder layer on the second substrate and the first manufacturing chamber is positioned for enabling an opening of the first cover. wherein the rotary manufacturing unit comprises a first manufacturing chamber and a second manufacturing chamber, wherein the first manufacturing chamber comprises a first openable cover and the second manufacturing chamber comprises a second openable cover, wherein the first manufacturing chamber comprises a first doctor blade configured to apply a powder layer on a first substrate, wherein the second manufacturing chamber comprises a second doctor blade configured to apply a powder layer on a second substrate, wherein the first manufacturing chamber and the second manufacturing chamber comprises an opening formed in the bottom of the rotary manufacturing unit through which the powder unit can be engaged with the rotary manufacturing unit, wherein a manufacturing chamber bottom plate of each manufacturing chamber comprises a sealing interface configured to hermetically seal the powder unit to the manufacturing chamber, wherein the rotary manufacturing unit is configured to be rotatable into a first position in which the first manufacturing chamber is positioned for irradiating the powder layer on the first substrate and the second manufacturing chamber is positioned for enabling an opening of the second cover, and into a second position in which the second manufacturing chamber is positioned for irradiating the powder layer on the second substrate and the first manufacturing chamber is positioned for enabling an opening of the first cover.