A commercially available alumina (CT9FG from Almatis) was mixed with cellulose and water to obtain an extrudable mass. The material was 3D-printed using a Stoneflower printer into the shape of testing bars with the dimensions of 25 mm x 25 mm x 150 mm. After sintering at 1600 °C for 2h, the samples were characterised before and after thermal shock. It was found that the elastic constants Young's modulus E0, shear modulus G0 and the Poisson number were in the range of 80-90 GPa, 30-32 GPa and 0.2, respectively, at an open porosity level of approximately 50 %. After five thermal shocks (cooling from 950 °C with air), these values reached a plateau at around 1/3 E0, 1/3 G0 and a Poisson number of 0.4. The material is intended to be used as refractory material for 3D-printed crucibles in metallurgy application.