PRINTING 3D PARTS WITH CONTROLLED SURFACE FINISH
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United States of America Patent
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app pub date -
Apr 6, 2016
filing date -
Apr 6, 2016
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Abstract
A 3D part and a support structure is printed using an electrophotography-based additive manufacturing system. A support layer of the support structure is developed with a first electrophotography engine using a support material and transferred to a transfer medium. A large-particle part layer corresponding to a first portion of the 3D part is developed with a second electrophotography engine using a first part material and transferred to a transfer medium, and a plurality of small-particle part layers corresponding to a second portion of the 3D part are developed with one or more additional electrophotography engines using a second part material and transferred to a transfer medium. An average size of the first part material particles is at least two times that of the second part material particles. The transferred support layer, large-particle part layer and small-particle part layers are transfused to previously-printed layers using a layer transfusion assembly.
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