A three-dimensional fabrication system (100, 200, 300) comprising: an agent delivery system; an energy supply system; and a controller (110, 302) configured to: control the agent delivery system to deposit a fusing agent onto a fusing area of a layer of particles of build material; control the agent delivery system to deposit an energy absorbing agent onto an unfused thermal support area of the layer of particles, the unfused thermal support area being located adjacent to the fusing area; control the energy supply system to supply energy, wherein supply of the energy is to cause the particles on which the fusing agent has been deposited to melt and a temperature of the particles in the unfused thermal support area to be raised to a level that is below a melting point temperature of the particles; and characterized in that the controller (110, 302) is further configured to: determine that the fusing area of the layer of particles comprises a size below a certain size; and control the agent delivery system to deposit the energy absorbing agent onto the unfused thermal support area based on the determination that the fusing area of the layer of particles comprises a size below a certain size; wherein the certain size pertains to a thickness, a width, a length, an area, a volume, or combinations thereof, of the fusing area. an agent delivery system; an energy supply system; and a controller (110, 302) configured to: control the agent delivery system to deposit a fusing agent onto a fusing area of a layer of particles of build material; control the agent delivery system to deposit an energy absorbing agent onto an unfused thermal support area of the layer of particles, the unfused thermal support area being located adjacent to the fusing area; control the energy supply system to supply energy, wherein supply of the energy is to cause the particles on which the fusing agent has been deposited to melt and a temperature of the particles in the unfused thermal support area to be raised to a level that is below a melting point temperature of the particles; and characterized in that control the agent delivery system to deposit a fusing agent onto a fusing area of a layer of particles of build material; control the agent delivery system to deposit an energy absorbing agent onto an unfused thermal support area of the layer of particles, the unfused thermal support area being located adjacent to the fusing area; control the energy supply system to supply energy, wherein supply of the energy is to cause the particles on which the fusing agent has been deposited to melt and a temperature of the particles in the unfused thermal support area to be raised to a level that is below a melting point temperature of the particles; and characterized in that the controller (110, 302) is further configured to: determine that the fusing area of the layer of particles comprises a size below a certain size; and control the agent delivery system to deposit the energy absorbing agent onto the unfused thermal support area based on the determination that the fusing area of the layer of particles comprises a size below a certain size; wherein the certain size pertains to a thickness, a width, a length, an area, a volume, or combinations thereof, of the fusing area. determine that the fusing area of the layer of particles comprises a size below a certain size; and control the agent delivery system to deposit the energy absorbing agent onto the unfused thermal support area based on the determination that the fusing area of the layer of particles comprises a size below a certain size; wherein the certain size pertains to a thickness, a width, a length, an area, a volume, or combinations thereof, of the fusing area.