Additive manufacturing of injection moulds is a direct rapid tooling method and enables a reduction in development time for new moulds as well as a reduction in development costs. One challenge of 3D printed tools manufactured by using stereolithography-based printing methods is the limited tool life. Due to the high cyclic temperature- and pressure-loads, complete failure often occurs after a few hundred cycles. In the present work, three distinct resin systems based on different polymerization mechanisms are investigated with the aim of increasing tool life. Besides thiol-ene methacrylate systems, which have a significantly higher ductility than pure (meth)acrylate resin systems, additional photopolymers based on dual-cure mechanisms are investigated. For this purpose, acrylate-epoxy resins are explored, which polymerize as a result of a simultaneous curing strategy. Furthermore, resin systems consisting of (meth)acrylates and propargylether derivatives of bisphenol A, which react according to a sequential curing mechanism are studied. Both material systems lead to the formation of so-called interpenetrating networks with the aim of increasing the heat deflection temperature of the photopolymers. Finally, inserts for injection moulds were additively manufactured with selected resin systems and subsequently tested in the injection moulding process. With the system based on acrylate and epoxy monomers, more than 1000 cycles could be realised, depending on the geometry.