The Bambu 4-in-1 PTFE adapter is used to connect the PTFE tube. Compared to the original PTFE tube connection, the 4-in-1 adapter can connect up to four feeder modules to the printer simultaneously (up to 7 different filaments: 1 AMS and 3 additional filaments).
It allows users to connect the printer to both the AMS and other filaments that are not compatible with the AMS, such as TPU 95A, Bambu PET-CF and filaments from other brands containing carbon fibre or glass fibre.