An additive manufacturing apparatus, comprising: a build module (10, 100, 200) comprising: a build chamber (18, 118, 150, 218); a powder recovery chamber (22, 122, 154, 222); and a build module worksurface (12, 112, 212) including a build chamber opening communicating with the build chamber (18, 118, 150, 218); and at least one of but less than all of the following elements: (a) a directed energy source (72, 372); (b) a powder supply (14, 114, 314); (c) a powder applicator (16, 116, 316); and a workstation (71, 71') comprising: the remainder of elements (a)-(c) not included in the build module (10, 100, 200); and an enclosure sized to enclose the build module (10, 100, 200), the directed energy source (72, 372), the powder supply (14, 114, 314), and the powder applicator (16, 116, 316); and a transport mechanism (70, 370) comprising a turntable disposed partially within the enclosure and defining a transport-mechanism worksurface configured to receive the build module (10, 100, 200) therein, the transport-mechanism worksurface being coplanar with the build-module worksurface so as to define a virtual workplane, and the transport mechanism (70, 370) being configured to move the build module (10, 100, 200) in to and out of the workstation (71, 71'). a build module (10, 100, 200) comprising: a build chamber (18, 118, 150, 218); a powder recovery chamber (22, 122, 154, 222); and a build module worksurface (12, 112, 212) including a build chamber opening communicating with the build chamber (18, 118, 150, 218); and at least one of but less than all of the following elements: (a) a directed energy source (72, 372); (b) a powder supply (14, 114, 314); (c) a powder applicator (16, 116, 316); and a build chamber (18, 118, 150, 218); a powder recovery chamber (22, 122, 154, 222); and a build module worksurface (12, 112, 212) including a build chamber opening communicating with the build chamber (18, 118, 150, 218); and at least one of but less than all of the following elements: (a) a directed energy source (72, 372); (b) a powder supply (14, 114, 314); (c) a powder applicator (16, 116, 316); and (a) a directed energy source (72, 372); (b) a powder supply (14, 114, 314); (c) a powder applicator (16, 116, 316); and a workstation (71, 71') comprising: the remainder of elements (a)-(c) not included in the build module (10, 100, 200); and an enclosure sized to enclose the build module (10, 100, 200), the directed energy source (72, 372), the powder supply (14, 114, 314), and the powder applicator (16, 116, 316); and the remainder of elements (a)-(c) not included in the build module (10, 100, 200); and an enclosure sized to enclose the build module (10, 100, 200), the directed energy source (72, 372), the powder supply (14, 114, 314), and the powder applicator (16, 116, 316); and a transport mechanism (70, 370) comprising a turntable disposed partially within the enclosure and defining a transport-mechanism worksurface configured to receive the build module (10, 100, 200) therein, the transport-mechanism worksurface being coplanar with the build-module worksurface so as to define a virtual workplane, and the transport mechanism (70, 370) being configured to move the build module (10, 100, 200) in to and out of the workstation (71, 71').