An apparatus for fabricating a three-dimensional object from a representation of the object stored in memory. The apparatus includes a drum supported for rotation. A build platform is supported for linear movement within the drum from a first position adjacent a first end of the drum to a second position within the drum. The build platform is rotationally fixed relative to the drum such that the build platform rotates with the drum. A powder feed hopper is fixed at a position above a first portion of the build platform. At least one directed energy source is positioned above the build platform and is configured to apply directed energy to a majority of the remaining portion of the build platform excluding the first portion.