Novel steels and alloys are essential in establishing beam-based additive manufacturing (AM) techniques in industrial production due to currently limited material spectrum weldable, respectively printable. When additively processed via laser- or electron-beam, numerous metallic materials face barriers based on undesired solid-state or hot cracking. Tool dies for metal shaping with contour-close cooling epitomize this clash between tremendous geometrical design-freedom leading to performance enhancements through AM versus lack of easily printable tool steels. In this presentation, novel printable matrix tool steels are system designed, enabling simple processing demonstrated via laser powder bed fusion. The applied mechanistic material design fundaments on thermo-chemical models interfaced with thermodynamic calculations using the Calculated Phase Dynamics (CALPHAD) method to predict the steels' properties. Subsequently, the designed prototypes are experimentally validated, representing a lean and resource-efficient material development. The material concept developed is transferable to numerous steels exploiting the AM process routes' full potential.