长江材料：目前生产的3D打印砂用于打印各类砂型

Group 1 - The core viewpoint of the article is that Changjiang Materials (001296) clarified its production focus on 3D printing sand, which is used for printing various sand molds for casting, rather than directly printing components [1] Group 2 - The company currently produces 3D printing sand that is utilized in sand mold casting to create various materials and shapes of castings [1] - The company does not engage in the direct printing of parts using 3D printing technology [1]