Metal Powder Bed Fusion Lab Direct Metal Laser Sintering (DMLS) EOSINT M280 250x250x325 mm (9.8×9.8×12.8 in) build volume20 μm layer thickness400 W laserHeat treatment ovenAbrasive polishing Renishaw AM250 250x250x300 mm (9.8×9.8×11.8 in) build volume20 μm layer thickness200 W laser What is Direct Metal Laser Sintering? DMLS functions in a similar way to polymer SLS, where a laser is used to selectively fuse layers of metal powder. Unlike polymer SLS, however, DMLS requires support structures for overhanging features. Due to the extreme temperatures associated with fusing the metal powders, large internal stresses can develop within DMLS parts. Post-build heat treatment is often used to mitigate the effects of the residual stresses and limit warping. Additional heat treatment such as hot isostatic pressing (HIP) may also be necessary to reduce the porosity within the sintered parts. DMLS Advantages Near full density metal partsComplex internal and external geometric capabilitiesWide range of material options DMLS Considerations Avoid closed cavities or small openings that may prevent powder removalSupport structures are required for overhangs that exceed 45 degreesAvoid internal overhanging geometries where support structures cannot be removedFeature sizes should be larger than 0.5 mm
