Laser sintering

Laser sintering is an additive manufacturing process in which plastic powder is selectively sintered. The energy for melting is introduced by a laser, among other things. Once all layers have been completed, the component can be removed from the powder bed. The remaining powder can be used for further production, provided it is mixed with new powder.
Laser melting

In the laser melting process, powdered metals are selectively melted. The melting energy is applied by one or more lasers. High-power ytterbium fibre lasers are used as lasers. After melting, a solid material layer is formed by solidification. Very high component densities (> 99%) can be achieved.
Fused Deposition Modelling

In the fused deposition modelling (FDM) process, a thermoplastic material is used as the starting material. The extrusion head heats the material and creates each component layer along a calculated mould path using a molten plastic strand. The thermal energy causes the deposited strand to bond with the lower component layer. As the strand cools, a permanent bond is created between two component layers.
ARBURG Plastic Freeform Moulds

In contrast to conventional additive manufacturing processes, ARBURG Plastic Freeforming (APF) melts qualified standard granulates in the same way as injection moulding. The freeformer produces the component from tiny droplets on the basis of 3D CAD data.
Source: arburg.de