This　article　is　a　comparative　study　of　tungsten　(W)　and　molybdenum　(Mo)　samples　manufactured　by　selective　laser　melting　(SLM).Under　the　processing　parameters　different　microstructural　and　mechanical　properties　like　strain　energy　density,　micro-hardness　and　surface　morphology　were　investigated.　Before　the　preparation　of　samples　the　SEM　and　XRD　images　were　taken　to　calculate　the　size　of　micro　particles　of　both　the　samples.　These　samples　were　further　investigated　by　OM(optical　microscopy),SEM(scanning　electron　microscope),EBSD(electron　backscattering　diffraction)　and　Vicker　hardness　to　study　the　crystallographic　structure,　hardness,　grain　boundaries　to　understand　a　brief　comparison　between　these　two　fourth　group　elements.　It　was　identified　as　the　cause　of　a　very　prominent　structure　with　cracked　features　and　a　residual　remains.　During　processing,　different　processing　factors　were　examined,　which　separates　at　the　edges　of　the　grain,　thereby　creating　thermal　cracks.　This　due　to　the　low　eutectic　melting　compared　to　the　matrix　phase.　These　factors　also　result　in　a　higher　Ductile-to-Brittle　Transition　(DBTT).　Later,　during　rapid　cooling　from　the　melting　point,　a　combination　of　cracks　with　hot　cracks　on　the　borders　of　solid　grain　grains　and　cold　cracks　near　weak　grain　edges　forms　a　cracked　network,　which　is　often　found　in　tungsten　and　molybdenum　refined　SLM.　Neither　does　a　very　hot　substrate　plate　prevent　the　formation　of　cracks　in　the　metals　formed　by　processing　parameters.　These　materials　are　appropriate　for　high　temperature　up　to　more　than　20000C　such　an　analytic　and　inner　wall　constituents　of　fusion　reactor　or　experiments.　Parameters　like　laser　power,　scan　speed,　hatching　space　and　the　thickness　of　the　powder　layer　are　analyzed　to　achieve　the　high　density　samples.　Three-dimensional　printing　is　changing　the　way　we　make　things　in　almost　every　industry,　from　cars　to　medical　equipment　to　biotech.3D　printing　to　prototype　one　of　the　most　critical　enabling　technology　in　a　building,　the　heat　exchanger.　In　comparison　to　current　designs,　this　next-generation　heat　exchanger　weighs　20%　less,　performs　20%　better,　and　can　be　produced　much　faster.　　©　Published　under　licence　by　IOP　Publishing　Ltd.