The ZH - 20 Pellet 3D - printing Extruder is a high - performance and high - speed printing head developed for large - sized robotic arms. It is suitable for printing large - sized models with high wall thickness. The printing head weighs approximately 70 kg, with a maximum extrusion rate of up to 20 kg per hour. The heating temperature can reach 500 °C, and the aperture of the extrusion head ranges from 6 to 16 mm. This printing head has passed a 500 - hour continuous and stable extrusion test.