Imager assembly and method for solid imaging

An imager assembly (722,722',722",722"') for making three-dimensional objects (28), the imager assembly (722,722',722",722"') solidifying a solid imaging build material layer-by-layer to build the three-dimensional object (28), the solid imaging build material having a predetermined value for the threshold energy of solidification, wherein said imager assembly (722,722',722",722"') comprises at least two or more imagers comprising an array of individually controlled imaging elements for transmitting radiation from said source, each said individually controlled imaging element corresponding to a pixel and each said array producing a projected image area wherein said pixels of adjacent projected image areas (702,702',702",702"') aligningly overlap to produce a single combined image area having boundaries corresponding to a layer of the three-dimensional object and seams (702/702') corresponding to said pixel overlap located between said projected image areas (702,702'), one or more of which boundaries cross one or more of said seams, said controller adjusting exposure of each said pixel (712,714) contributing to said boundaries in said single combined image area for providing to said pixels the predetermined threshold energy for solidification of the build material defining said boundaries.