This article examines the potential of 3D printing to replace CNC machining in manufacturing. It details the processes, cost structures, material options, and applications of both technologies. While 3D printing offers unmatched design flexibility and rapid prototyping capabilities, CNC machining excels in precision, surface finish, and large-scale production. The future manufacturing environment favors an integrated use of both methods, demonstrated by companies like Shangchen providing combined solutions for optimal results.