Additive manufacturing with traversing irradiation region

Additive manufacturing apparatus comprising:

• a build platform having two laterally adjacent supply zone platforms opposite one another along sides of the build platform, the build platform to receive build material from the supply zone platforms, the supply zone platforms to receive build material by conveyance from a separate reservoir;
• a heater to direct radiant heat to traverse the build platform and the supply zone platforms along a first lateral axis;
• a carriage to traverse the build platform along a direction parallel with the first lateral axis;
• wherein the carriage comprises a coating module to apply build material from the supply zone platforms onto the build platform or a print module to eject a print agent onto build material on the build platform;
• and
• wherein the carriage is moveable to traverse the build platform independently of the heater.