Abstract: Compositions and methods are provided for generating ultra-high loaded, ultra-high temperature ceramics (UHTCs) ink for extrusion three-dimensional (3D) printing with enhanced shrinkage control. The advanced formulations significantly enhance printability, densification, and microstructural control of complex UHTC components, facilitating near-net-shape fabrication with improved mechanical properties and thermal stability. Consequently, the innovation significantly diminishes the necessity for extensive post-processing, minimizes defects such as shrinkage and cracking, and broadens the applicability of additive manufacturing techniques for high-performance refractory materials in extreme environments.