Fig. 11. 3D inscription made by the cationic photopolymerization of monomer mixtures: DEGBA/EPXPROP composition (70%/30% w/w) in the presence of a two-component photoinitiating system based on BI-PH-S-CH₃ (0.2 wt%) and bis-(4-t-butylphenyl)iodonium hexafluorophosphate (2 wt%).