What parameters do we recommend to print concrete?

The recommended nozzle diameter range for 3D printing of cement mixtures is 18-30 mm. The layer height varies from 9 to 15 mm, considering the layer/nozzle height ratio = 0.5. The thickness of the single layer varies from 20 to 40 mm, considering the partial expansion when laying the material. The nozzle diameter range of clay-based mixes is 8-18 mm.