The X2D is Bambu Lab’s enclosed, CoreXY flagship built around a dual-nozzle toolhead: one nozzle on a direct-drive extruder, the second fed through a lightweight bowden path, with a mechanical switching system that swaps which one is active. That is a different setup from the single-nozzle X1 Carbon, and it changes how the first print goes. Do not assume the X1C’s lidar-based routine applies here. It does not.
Before you print anything: leave the foam alone
If you just unboxed the printer, do not pull the protective foam out from under the heatbed yet. Bambu’s own setup instructions call this out specifically for the X2D: the initial calibration sequence runs with that cushioning still in place, and removing it early can throw off the bed leveling pass. Follow the on-screen prompts in order and only clear the foam when the screen tells you calibration is done.
What calibration actually checks
Once you power on and confirm the toolhead and AMS connections, the printer walks through its startup calibration on its own. This is not optional and you should let it finish before touching anything.
A few things happen in sequence:
- Auto bed leveling. The printer builds a mesh of the plate and adjusts for it, aiming for a consistent nozzle-to-plate gap in every corner rather than a single flat assumption.
- Vibration and resonance compensation. The toolhead moves through a series of test patterns on X and Y to measure resonance and calculate input shaping values. You will hear it during this step. It is normal.
- Flow dynamics calibration. This tunes pressure advance for the loaded filament and, on the X2D, keeps monitoring the extrusion motor, hotend, and filament behavior during printing rather than treating it as a one-time setup step.
- Nozzle offset calibration. This is the one that matters most for a dual-nozzle machine. The two nozzles are not mounted in exactly the same spot, so the printer needs to know the XY (and height) offset between them before it can align prints that use both.
On the nozzle offset step specifically: the X2D does not use the Micro Lidar that the X1 Carbon relies on for plate scanning. Bambu’s own maintenance documentation is explicit about the replacement: two eddy current sensors, one mounted next to each hotend, handle Z-axis homing and bed leveling for their own nozzle, and a separate nozzle offset calibration sensor mounted behind the heatbed works together with those two eddy sensors to measure the position of both hotends and calculate the offset between them. That is a sensor-based measurement, not lidar distance scanning or camera-based vision. You can trigger the high-precision version of this check manually from Settings, then Calibration, then High-Precision Nozzle Offset Calibration, if you ever suspect the two nozzles have drifted out of alignment. Some third-party write-ups describe the X2D as having a lidar for first-layer scanning; that claim does not match Bambu’s own sensor documentation and is worth ignoring.
I also could not pin down a reliable figure for how long the full calibration routine takes. Estimates in circulation range from under ten minutes to well over twenty, which is too wide a spread to print as fact. Budget more time than you think, and do not interrupt it.
Loading filament for two nozzles
The X2D pairs with the AMS 2 Pro, and the mapping between AMS units and hotends is fixed rather than something you reassign per print. If you are running an AMS on each side, load your primary and support (or multi-color) filaments into their assigned slots before you queue anything.
Bambu Studio’s filament grouping matters more here than on a single-nozzle printer. When you slice a model that only needs one material, the slicer can still decide whether to run it through the left or right hotend based on your grouping strategy. Filament-saving mode, for example, tries to keep material assignments efficient across the two nozzles rather than defaulting to one side every time. Check the filament assignment step in Studio before you send the job, because a first print with the wrong nozzle mapped to the wrong material is an easy way to waste your first hour with the machine.
What to print first
For your very first job, stick to something Bambu ships as a ready-to-go internal or pre-sliced model rather than something you slice yourself. These are chosen specifically to exercise both nozzles (if the model uses two materials) without pushing tolerances that a freshly calibrated machine has not proven itself on yet. If a dual-material demo model is available on the touchscreen or in Bambu Handy, that is a reasonable first choice precisely because it forces the nozzle-switching mechanism to run early, while you are still standing next to the printer.
To start it from the touchscreen: tap Print Files, pick the model, confirm the build plate type and nozzle diameter shown on screen match what is actually installed, assign the loaded filament to each hotend the model calls for, then tap Print. You can do the same from Bambu Handy or from Bambu Studio if you would rather queue it from your computer.
Watching the first layer
Stay with the printer for the first layer. This is true of every FDM printer, but it matters more here because a dual-nozzle first layer has two failure points instead of one: the primary nozzle’s adhesion and the secondary nozzle’s alignment relative to it.
Look for:
- Even, consistent lines across the whole layer with no visible gaps between passes.
- No shifting or offset between sections printed by different nozzles, if the model uses both. A visible seam or misalignment between materials at this stage usually means the nozzle offset calibration needs to be rerun.
- Smooth adhesion to the plate. Curling corners or a first layer that looks scraped rather than laid down cleanly is worth pausing for.
If the printer has a chamber camera active, use it to keep an eye on things without hovering directly over the bed. Camera-based monitoring on this printer reportedly extends past the first layer, watching for tangled filament, foreign objects on the bed, plate misdetection, and nozzle clogging throughout the print, running on the printer’s own processor rather than relying on a cloud connection. This is separate from the toolhead camera used for offset calibration.
If something looks off
Do not immediately blame the printer for a rough first layer. Run through the basics first: confirm the correct build plate was selected on screen, confirm the loaded filament matches what Studio thinks is loaded, and rerun auto bed leveling if the gap looks uneven in different corners.
If the issue is specific to alignment between the two nozzles, such as a double-walled effect or a visible seam where the toolhead switched, that points at the nozzle offset calibration rather than bed leveling. Rerunning the high-precision offset calibration from the Settings menu is the more targeted fix, rather than repeating the full startup routine.
If you get an error code during any of this, the X2D’s dual-nozzle toolhead reports extruder-switching faults on its own code range, separate from Bambu’s single-nozzle printers. Match the code shown on screen against the specific X2D error reference rather than a generic Bambu troubleshooting page, since the fix for a switching fault is not the same as a fix for a generic extrusion problem.
Related X2D guides: if you haven’t already, start with unboxing and safe first setup. For deeper detail on any calibration step, see the full bed leveling and calibration guide. For filament questions, check loading, unloading, and changing filament, and for slicer setup see Bambu Studio setup. Error codes are covered in the X2D HMS error index.