Additive manufacturing apparatus and methods

An additive manufacturing apparatus comprising:

• a build chamber;
• a build platform lowerable in the build chamber such that layers of flowable material can be successively formed across the build platform;
• a radiation generator for generating an energy beam;
• a scanner for directing the energy beam onto each layer to selectively solidify the material, the scanner comprising a first beam steering component for deflecting the energy beam over a first range of angles in a first dimension and a second beam steering component for deflecting the energy beam over a second range of angles in the first dimension,
• wherein the second beam steering component provides a faster dynamic response but a smaller range of movement of the energy beam than the first beam steering component;
• and
• a controller arranged to control the first and second beam steering components to accelerate/decelerate the energy beam in the first dimension using the faster dynamic response of the second beam steering component synchronously whilst moving the energy beam in the first dimension using the first beam steering component actuator.