High-speed sintering (HSS) is a non-beam powder bed fusion in which each layer is scanned twice. First, a shape is defined on a layer by ink jetting using a printhead, and then the whole layer is irradiated by a thermal lamp to consolidate that shape. The ink is a radiation-absorbing material, which causes the area on the layer where the ink is jetted to absorb more thermal radiation than other adjacent areas. The role of the printhead is to mark areas on a layer, which constitute a part. The thermal lamp does not mark any area and thus does not need the details of the CAD file of the part. The lamp is thus free from toolpath and covers the whole layer from one end to the other. Therefore, the speed of the lamp is relatively fast, which gives the name “high speed sintering.”