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Injection moulding is one of the most critical polymer processing technologies. The most significant phase of the injection moulding cycle is cooling time, which can be more than half the whole cycle [1]. One of the best ways to achieve a reduction in cooling time is to use mould inserts with conformal cooling [2]; shrinkage and warpage can thus also be decreased [3]. With layer manufacturing technologies, parts of complex internal structures can be built, which can be a major advantage for injection moulds [4]. The cooling channels may have a complex form, which cannot be manufactured with conventional methods, such as drilling or milling [5]. Tooling companies are increasingly employing additive manufacturing (AM) technologies to fabricate moulds with integrated conformal cooling channels. Selective laser sintering (SLS) is an AM technique, which is capable of manufacturing 3D parts from different powder materials [6]. The powder is scanned and selectively sintered according to the two-dimensional crosssection of the sliced model of the CAD geometry. In the beginning, these systems only worked with polymer powders. Then, as the technology developed, companies introduced laser sintering processes for building parts from metal powders. Direct metal laser sintering (DMLS) [7] and selective laser melting (SLM) [8] are the most widespread techniques at present, and both technologies use metal powders without coating [9]. Producing mould inserts from metal powders by AM is an expensive technology in comparison to conventional machining. A major challenge is to integrate free shape AM and cheap conventional manufacturing processes [10]. Metal AM is a promising technology to fabricate complex geometry and hybrid structures from different metals, e.g. cobalt-based alloy deposited on conventional tool steel [11] or sintering of maraging steel on a copper substrate [12]. Surface Modification and Wear Properties of Direct Metal Laser Sintered Hybrid Tools Used in Moulds Hatos, I. − Fekete, I. − Ibriksz, T. − Kovács, J.G. − Maros, M.B. − Hargitai, H. István Hatos1,* − Imre Fekete1 − Tamás Ibriksz1 − József G. Kovács2 − Mária B. Maros3 − Hajnalka Hargitai1