Bambu Filament Track Switch Review: Why I Call It Bambu’s Best Accessory This Year
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Time to read 6 min
If you own an X2D, this Bambu Filament Track Switch Review is simple: it is the first accessory that meaningfully changes how daily multi-material work feels. Instead of treating your AMS units as “left AMS” and “right AMS,” the track switch breaks the fixed binding between AMS and nozzle. That single change reduces manual intervention more than most “performance” add-ons.
I call it Bambu’s best accessory this year because it improves the workflow for the exact moment where dual-nozzle printing becomes painful: when the filament you want is in the “wrong” AMS for the nozzle you need.
And this is also why upcoming firmware support matters so much. Bambu has indicated H2C adaptation is planned for Q2, and H2D firmware completion is planned for Q3. For H2D users, this accessory is potentially a massive quality-of-life upgrade, because it turns a messy dual-nozzle + multi-AMS setup into a cleaner, software-routed workflow. With the switch installed, the printer can route filament from any connected AMS to either nozzle, which makes dual-nozzle printing feel closer to “choose the material, press load, keep printing.”
Table of contents
What the Filament Track Switch Actually Does (in plain English) The core mechanism (why it can “re-wire” AMS-to-nozzle automatically) The available feed paths How the printer knows which AMS is connected to which inlet The Real Advantage: No More “Left AMS / Right AMS” Thinking A real X2D scenario (PLA main + PETG support) What changes after installing the track switch Installation Notes That Actually Matter Recommended PTFE tube lengths (reduce resistance) Avoid the wrong PTFE adapter Don’t fully tighten immediately AMS Setup: Auto Mode vs Manual Mode Auto Mode Manual Mode Day-to-Day Loading Behavior (and why it matters) Limitations and “Don’t Buy It If…” Guidance Only X2D support (right now) Dual-nozzle with one AMS is not simultaneous Some filaments are more failure-prone Calibration note Why I Still Call It “The Best Accessory” (with a defensible definition)
Sanwen
SANWEN is a dedicated content creator focusing on 3D printing education, with a particular expertise in FDM 3D printing for beginners. He simplifies complex 3D printing knowledge into easy-to-understand tips and practical guidance, covering filament selection, parameter calibration, print bed setup, and troubleshooting common issues like warping. His content aims to lower the entry barrier for new 3D printing enthusiasts, helping them master essential skills and achieve successful prints quickly.
What the Bambu Filament Track Switch Actually Does?
The Filament Track Switch has two inlets (In-A, In-B) and two outlets (Out-A, Out-B).
The core mechanism (why it can “re-wire” AMS-to-nozzle automatically)
At a high level, it’s a two-channel path switch:
- You have two AMS feeds coming in.
- You have two nozzle paths going out.
- Inside the module, two electromagnets toggle the internal guide mechanism to switch the active feed route.
That switching action is what allows the printer to dynamically map either AMS feed to either nozzle path, instead of locking “AMS A = left nozzle” and “AMS B = right nozzle.”
The available feed paths
With this dual-inlet + dual-outlet design, the printer can select between four possible feed paths:
- In-A → Out-A
- In-A → Out-B
- In-B → Out-A
- In-B → Out-B
How the printer knows which AMS is connected to which inlet
Each inlet has its own sensor. When filament is inserted, the sensor is triggered, and the printer can identify which inlet that AMS is currently connected to. When the printer needs to change the route, it actuates the electromagnets, flips the internal path, and pushes filament to the target nozzle.
The Real Advantage: No More “Left AMS / Right AMS” Thinking
Before the switch, dual-nozzle workflows often force a rigid setup:
- Left nozzle uses filament from the left AMS.
- Right nozzle uses filament from the right AMS.
That sounds fine until you want to use dual-nozzle strategically.
A real X2D scenario (PLA main + PETG support)
A common “best practice” workflow looks like this:
- Main material: PLA on the better-performing nozzle (your “main” nozzle).
- Support interface / supports: PETG on the other nozzle.
So you set it up like:
- AMS #1 → Main nozzle → PLA
- AMS #2 → Secondary nozzle → PETG
Now the pain point: when you want to print a PETG part.
In the old fixed-mapping world, to keep PETG on your main nozzle (because the secondary nozzle prints worse), you typically had to do one of these before the job:
- Swap spools between AMS units, so PETG ends up on the AMS that feeds your main nozzle.
- Physically swap PTFE routing at the back (rebind which AMS feeds which channel / buffer path).
Both options are annoying, easy to forget, and easy to mess up mid-workflow.
What changes after installing the track switch
After installing the switch, you can keep your AMS loaded the way you like (PLA, PETG, etc.), and let the printer route the filament to the nozzle you choose. Practically, this means:
- You can keep PETG on the main nozzle when printing PETG.
- You can still use PETG as support when printing PLA.
- You do far less “pre-print plumbing” (spool swaps and PTFE re-routing).
That’s why, for real dual-nozzle users, this accessory saves more time than many upgrades that only improve a single variable.
After installing the switch, you can route filaments from all connected AMS units to either nozzle. In practice, this means fewer “stop the job, move spools, re-route PTFE tubes” moments.
Installation Notes That Actually Matter
This section is included so the Bambu Filament Track Switch Review is actionable, not just descriptive.
Recommended PTFE tube lengths (reduce resistance)
To keep loading and unloading reliable, keep PTFE tubes short:
- From AMS to track switch: ≤ 700 mm
- From track switch to filament buffer: ≤ 115 mm
Shorter tubes reduce feed resistance and make mapping and retraction more consistent.
Avoid the wrong PTFE adapter
Do not use the H2C-specific 4-in-1 PTFE tube adapter II with X2D, because it is not compatible.
Don’t fully tighten immediately
When mounting the track switch to the holder:
- Tighten the silver screws lightly first.
- Leave a little movement.
- Fully tighten after the holder is fixed to the rear panel.
This reduces misalignment stress that can increase friction at the outlet.
AMS Setup: Auto Mode vs Manual Mode
On the printer screen, go to Filament and run AMS setup.
Auto Mode
In Auto Mode, each AMS feeds filament into the track switch inlet, and the inlet sensor tells the printer which inlet that AMS is connected to.
To avoid setup failures:
- Load at least one spool in every AMS.
- Unload any filament already fed.
Manual Mode
In Manual Mode, you tap the AMS icon and manually assign the track switch inlet (A or B). If there is no filament inside the AMS, Manual Mode can be more reliable.
Day-to-Day Loading Behavior
On the first load, the printer has not yet learned which inlet maps to which outlet. It will try the current switch position first. If it fails to reach the selected nozzle three times in a row, it retracts filament, flips the switch, and tries again.
Once it succeeds, the printer saves the mapping for future loads. This is important because it means the workflow gets smoother after initial learning.
Limitations and “Don’t Buy It If…” Guidance
A good Bambu Filament Track Switch Review should be honest about what the accessory cannot do.
Only X2D support (right now)
The track switch is currently supported only on X2D today. However, Bambu has indicated that H2C is planned to be adapted in Q2, and H2D is planned to complete firmware adaptation in Q3 (timeline subject to change via firmware releases).
Why this is huge for H2D owners: H2D users are exactly the group that benefits most from flexible AMS-to-nozzle routing. Once firmware support lands, the track switch should remove a major source of dual-nozzle friction: having the “wrong” filament sitting in the “wrong” AMS for the nozzle you want.
More models are being adapted, so firmware updates matter.
Dual-nozzle with one AMS is not simultaneous
With a single AMS, dual-nozzle printing is supported, but filament feeding is alternating, not simultaneous. The printer unloads first, then reloads.
Some filaments are more failure-prone
Higher resistance-sensitive filaments can struggle:
- PLA-CF
- PLA Glow
- PLA Silk
If loading/unloading problems appear, try:
- Moving that filament to a different AMS slot.
- Using the recommended PTFE tube lengths.
- Reducing sharp bends in tube routing.
Calibration note
After installing the switch on X2D, high-precision nozzle offset calibration cannot be performed at the moment. You need to remove the switch for that calibration until firmware updates address it.
Why I Still Call It “The Best Accessory”
“Best” can mean many things. In this review, best means:
- It removes the most common friction in a real X2D workflow.
- It makes multi-material routing decisions software-driven instead of manual.
- It reduces failed loads caused by human re-plumbing (PTFE swaps and re-binding).
For users who actually use dual-nozzle as intended, this is a bigger quality-of-life upgrade than most add-ons that only change one variable (like temperature, airflow, or noise).
