@article{gonçalves_ribeiro_santos_2023,  title={3D printing using metakaolin-based geopolymers - challenges},  volume={69},  ISSN={0366-6913},  url={https://doi.org/10.1590/0366-69132024703923508},  DOI={10.1590/0366-69132024703923508},  number={392},  journal={Cerâmica},  publisher={Associação Brasileira de Cerâmica},  author={Gonçalves, C. E. C. and Ribeiro, T. M. and Santos, S. F.},  year={2023},  month={Oct},  pages={340–345} }