This article explores the communication control technology of dual-nozzle 3D printers, based on the embedded web server/client network communication model, using the FDM 3D printer industrial control RepRap firmware platform. By studying the TCP/IP protocol, light weight internet protocol (LwIP) implementation and industrial control GM code, efficient and intelligent communication is achieved, getting rid of the limitations of traditional wired communication. Design the front-end interface, control instruction grouping and management methods, and establish a two-way information exchange protocol and network data processing mechanism. Innovation points include GM command classification management, TCP status tracking, the basis for transmitting network data to the G code execution space, and the protocol for timely transmitting 3D printer working status parameters to the web control end. This research provides innovative ideas for 3D printer network communication control and has important application prospects.