Illuminating new pathways: beyond conventional photochemistries for multi-photon 3D laser printing

In the expanding field of multi-photon 3D laser printing (MPLP), new chemistries for facilitating photocrosslinking have been slowly emerging alongside the currently predominant (meth)acrylate-based systems. Expanding the selection of available photochemistries is crucial for precisely tailoring inks to their respective applications. In this review, we present chemistries beyond established (meth)acrylates that have been adapted for MPLP. Firstly, intermolecularly photoinitiated systems that require a photoinitiator are discussed. We then further highlight chemistries that are intramolecularly initiated without the need for a photoinitiator, while discussing the impact the network architecture has on the properties and on potential applications.