Additive manufacturing, with its ability to assemble a variety of materials in complex and customized architectures, is developing rapidly. The integration of technologies and materials into a sustainable production,
however, is still challenging. The present investigation offers new functional glass-based products, from nearly
room temperature processing, based on direct ink writing (DIW) of pastes from ‘light’ alkali activation (2.5 M
NaOH) of pharmaceutical glass waste, added with 20 wt% of TiO2 nanoparticles. The inks were refined by the
inclusion of porous glass microspheres (PGMs, 20–30 wt%), previously fabricated from fiber glass waste. Printed
scaffolds, stabilized by simple drying (i.e. ‘unfired’), were successfully applied in the photodegradation of
methylene blue. The degradation efficiency reached 100% within 75 min, and the 3D-printed composites could
be easily separated from the solution for subsequent reuse. The degradation efficiency declined only by 7.5%,
after 5 cycles.