• Printing angle critically influences surface accuracy, shrinkage, and printing efficiency of green bodies, as well as microstructure and mechanical properties of sintered silica ceramic cores.
• Increasing printing angle reduces bonding area, worsens surface roughness, increases Z-direction shrinkage, and decreases printing efficiency, while also lowering bending strength.
• A printing angle of 30° halves printing time compared to 90°, improving molding efficiency while achieving required bulk density, open porosity, and flexural strength.
• Optimizing printing angles enables a balance between shrinkage, printing efficiency, and flexural strength, offering a promising route for rapid manufacturing of complex ceramic cores.