海正生材：公司专注于聚乳酸树脂的研发、生产和销售 聚乳酸是目前3D打印耗材的重要原料之一

Group 1 - The company focuses on the research, production, and sales of polylactic acid (PLA) resin, which is a key material for 3D printing consumables [1] - The company has established good upstream and downstream cooperative relationships with major 3D printing consumable manufacturers [1]