The　ceramic　manufacturing　sector,　recognized　as　a　highly　energy-consuming　industry,　is　set　to　boost　energy　efficiency　and　reduce　carbon　footprint.　Here,　we　present　a　new　self-sustaining　ceramization-assisted　additive　manufacturing　(AM)　of　ceramic　composite　structures.　The　eco-friendly　process　features　extrusion-based　printing　of　geopolymer-bonded　reactive　microparticles,　ambient　environment　curing,　and　self-sustaining　ceramization.　Our　approach　exhibits　an　extraordinarily　low　manufacturing　carbon　footprint　with　a　greenhouse　gas　(GHG)　emission　of　0.79　kg　of　CO2　equivalent/kg,　a　1000-fold　decrease　compared　to　standard　binder　jetting　ceramic　AM.　The　resultant　structure　comprises　a　Ti-Si-C-based　ceramic　composite,　simultaneously　showcasing　the　lowest　open　porosity　(22%)　compared　to　other　reactively　3D-printed　inorganic　structures.　The　proposed　technology　has　the　potential　to　pave　the　way　for　low-carbon　manufacturing　of　geometrically　intricate　ceramic　composite　structures.