A bis(acyl)phosphane oxide (BAPO) photoinitiator was conveniently synthesized in an efficient one-pot process. It shows excellent dispersibility in water, good storage stability, and high photo-reactivity in 3D printing of hydrogels under visible-light irradiation (460 nm).

Due to the high level of light absorption and light scattering of dark colored powders connected with the high refractive indices of ceramic particles, the majority of ceramics studied via stereolithography (SLA) have been light in color, including ceramics such as alumina, zirconia and tricalcium phosphate. This article focuses on a lithography-based ceramic manufacturing (LCM) method for β-SiAlON ceramics that are derived from silicon nitride and have excellent material properties for high temperature applications. This study demonstrates the general feasibility of manufacturing of silicon nitride-based ceramic parts by LCM for the first time and combines the advantages of SLA, such as the achievable complexity and low surface roughness (Ra = 0.50 µm), with the typical properties of conventionally manufactured silicon nitride-based ceramics, such as high relative density (99.8%), biaxial strength (σf = 764 MPa), and hardness (HV10 = 1500).

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Vinyl esters (VEs) are well‐examined monomers for additive manufacturing technology in tissue engineering. They display benefits like low cytotoxicity, good biocompatibility and favorable degradation behavior. Nevertheless, mechanical properties of crosslinked VEs are poor, as they show high brittleness. A previous study showed, that covalent incorporation of high molecular weight additive into an established vinyl ester‐thiol network circumvents these problems. In this work, additives based on poly(ε‐caprolactone) are modified with photopolymerizable end groups to improve the mechanical properties focusing on the toughness and to allow the application in digital light processing stereolithography. The different toughness enhancing additives and their influence on the photochemical and (thermo)mechanical characteristics are studied. As well, the impact of a commercial, flexible and a synthesized rigid thiol on these properties are investigated. It was shown that without forfeiting photoreactivity, the covalently incorporated toughness enhancers led to materials with excellent mechanical properties, above all the tensile toughness, which could be tripled.

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