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The present work reports the effect of the extrusion nozzles' size and consequent residual porosity on the flexural strength of 3Y-TZP bioceramics fabricated by direct write assembly technology. A printable ink containing a volume fraction of 45% of 3Y-TZP (ZrO stabilized with 3mol% Y O ) submicron powder, carboxymethyl cellulose and polyethyleneimine as additives was fine-tuned by rheological measurements. Different nozzle diameters (0.41mm, 0.33mm, and 0.25mm) were used to print 3D specimens with proper dimensions for structural and m