Based on this product's specifications, here are some alternatives and similar models
Extruder cover for Flashforge G3+/G3 3D printer — compatible accessory (MPN 50002311001)
Summary description:
Extruder cover designed for Flashforge G3+ and G3 3D printers. This replacement accessory protects the extruder assembly from dust and debris, helps maintain stable printing conditions and can simplify nozzle access during maintenance. Suitable for users needing a spare or replacement part to preserve printer performance and extend component life.