This　work　presents　specific　one-step　additive　manufacturing　of　crack-free　WC-12Co　cemented　carbides　by　the　laser　powder　bed　fusion　(LPBF)　technology　using　the　mixed　ultra-coarse　WC　and　agglomerated　Co　powder　as　feedstock.　The　critical　role　of　the　agglomerated　Co　in　elimination　of　cracks,　pores　and　carbon-deficient　phases　during　the　LPBF　fabrication　and　subsequent　heat-treatment　process　was　disclosed.　Moreover,　the　agglomerated　Co　led　to　the　formation　of　lath-shaped　WC　grains　containing　numerous　Co-rich　particles　with　sizes　ranging　from　a　few　nanometers　to　approximately　300　nm.　These　in-grain　Co-rich　particles　could　accommodate　plastic　deformation　and　hinder　dislocation　motion　within　lath-shaped　WC　grains,　but　did　not　cause　local　stress　concentration,　thereby　contributing　to　enhance　both　the　toughness　and　strength　of　the　resulting　cemented　carbides.　The　proposed　novel　strategy　of　tuning　the　distribution　state　of　metallic　phase　within　the　feedstock　holds　significant　potential　for　applications　in　the　direct　additive　manufacturing　of　high-performance　cermet　materials.