Development of 3D printing technology rapidly and widely used in machinery manufacturing. 3D printing business is much, but the efficient equipment is deficiency. Methods of 3D models collecting, processing and online displaying were studied. A 3D printing service platform was constructed based on Cloud computing technology. The service program was developed by ASP. The background of the platform was managed by MySQL database. CAD files were displayed on a HTML5 browser by WebGL. A 3D printer owner released the 3D printer information, users searched printers and uploaded models data. The models were manufactured by remote online printers. The platform provides excellent products manufacturing environment for 3D printer owners and users. Products and printers are full information sharing. The economic benefit is rich.