Filament Buffer 6pin Connector Board Replacement Guide for the Bambu Lab H3C | Bambu Lab Wiki
If you follow the Bambu Wiki instructions for the external AMS buffer, it’s pretty confusing whether you actually need to install the cable that comes with it. It says to install it if it has the cable, then later says you may not need to. Feels like a translation issue that didn’t come through clearly in English.
To install that cable you’d have to pull the entire rear panel. I didn’t install it on mine. The cable looked identical to the one already coming out the back. Same cable, same plug, same number of wires. I did NOT install it. Mine’s been working perfect without it. My E1 that is plugged into the side of the buffer is also working perfect.
Once the buffer is in, you need to run your own tubing from the AMS 3H to the buffer, then another piece from the buffer to your AMS. There’s a plug in the back of the AMS 3H that you open and feed the tubing through. That hole is massive. I made a TPU plug for it (link below if you want to print one). I molded PLA supports into the 3MF so it prints clean, and the plug is a tight fit so it doesn’t pop out when you’re printing or swapping tubes.|
The buffer’s been working great with my AMS HT on PLA, PETG, PC, PC-FR, and PETG-CF. It was not happy with PPA-CF or PPS-CF though. Those kept getting stuck at the buffer.