长江材料：公司生产的3D打印砂是用于砂型3D打印的主要原材料

Core Viewpoint - The company, Changjiang Materials, produces 3D printing sand, which is a primary raw material for sand mold 3D printing, primarily used in sample development and small batch casting production [1] Group 1 - The 3D printing sand produced by the company is utilized in the process of 3D printing sand molds for casting production [1] - The current applications of the company's products are mainly focused on sample development and small batch casting [1]