There are several technologies for printing metal parts from powders, some similar to MiM and others not. SLM (Selective Laser Melting) starts with a layer of powder contained in a prismatic en-closure (box) and builds the part layer by layer, through laser fusion of the powders. This technology is quite different than MiM in that the powders used are larger (50 microns compared to 20 microns for MiM) and the metallurgical structure is of the micro-foundry type with all the associated phenomena of segregation and residual stresses. Moreover, the powder layer is not self-supporting, and the process requires the creation of supports which must be removed through secondary operations.
The surface finishes are coarse, and the parts may be prone to cracking, but this technology can be used to produce large parts, especially when using alloys that are easily welded, such as titanium.