An additive manufacturing apparatus includes a platform, a first support, a first actuator to create relative motion along a first axis such that the first support scans across the platform, one or more printheads supported on the first support above the platform and configured to dispense successive layers of feed material to form a polishing pad, a second support, a second actuator to create relative motion along a second axis substantially perpendicular to the first axis such that the second support scans across the platform in a direction perpendicular to the first axis, and a plurality of individually addressable energy sources supported on the second support above the platform, and a controller. The energy sources are arranged in an array that extends at least along the first axis and configured to emit radiation toward the platform.