An additive manufacturing apparatus comprising a scanner (110) for directing a laser beam (118) on to layers of flowable material (104) to selectively solidify the material to form an object (103) in a layer-by-layer manner. The scanner comprises an optical component (106a, 106b) operable under the control of a first actuator (121a, 121b) to reflect the laser beam (118) over a first range of angles in a first dimension and the or a further optical component (106c) operable under the control of a second actuator (120a, 120b) to reflect the laser beam (118) over a second range of angles in the first dimension, wherein the second actuator (120a, 120b) provides a faster dynamic response but a smaller range of movement of the laser beam (118) than the first actuator (121a, 121b).