Dual Colour 3D-Printed Porcelain Bowls

Blue and White Ceramics is a collaborative work with Silvester Mok. They are printed by a dual-extruder clay printer with a fully steerable concentric nozzle. Through precise directional control of the inner needle, the system achieves either complete material encapsulation or controlled ratios of material exposure on interior and exterior print surfaces. The system produces graded or high-contrast textured surfaces in a single pass before firing.

The movable inner nozzle enables mechanical mixing at the extruder tip, ensuring optimal water distribution in the colloidal suspension while improving both inter-material adhesion and layer-to-layer bonding.

Two implementations were demonstrated: one using separate syringes and plungers, and a more compact version using concentric reservoirs with a single plunger. With dual-extruder clay printing, the ceramics are able to achieve bi-color printing in blue and white. Through independent material flow control, precise inner extruder positioning, and adjustable retraction within the outer cone, this research opens new possibilities in multi-material clay printing by harnessing the physics of wet, granular matter directly at the extrusion point.