爱司凯：公司采取销售、合作设立打印中心等多种方式销售3D砂型打印设备

Group 1 - The company has a 3D printing center that operates through various sales methods, including direct sales, partnerships, and establishing printing centers [2] - The company emphasizes the combination of market scale and business model in its operations [2] - The inquiry about the operational model of the 3D printing center was made by an investor on an interactive platform [2]