Dear Community,
I’m reaching out for ideas or insights regarding a persistent issue with X1C where Flow Dynamic Calibration consistently fails - despite extensive troubleshooting over the past weeks/months.
TL;DR:
- Calibration always fails (“Result could not be saved”), despite latest firmware (v01.09.01.00) and Bambu Studio (2.1.1.52).
- Calibration process appears to complete (no crash or direct error on the printer, “ok”), but the result isn’t saved at Studio.
- LiDAR module already replaced, changed.
- Cables were found pinched during reassembly; inspected and re-soldered — no change.
- Another X1C with same filament, plate, and profile works fine.
Laser visibility note:
At first I thought the laser wasn’t working, but later learned it’s only visible using the printer’s internal camera - not to the naked eye oder mobile phone in my place.
Background Timeline:
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Early 2024: Calibration used to work. After several firmware updates, calibration began to fail - no changes to environment/setup; Ticket at BambuLab. Communication with BambuLab difficult, no response.
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June 2025: Installed FW v01.09.01.00 – no improvement.
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Replaced LiDAR module - Movement and white reflection visible during calibration, no errors.
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Ran tests with known-good filament (Bambu PLA, PETG HF), on clean textured and smooth beds, in complete darkness, and with external light off.
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Factory reset + reinstallation of Bambu Studio, firmware, and profile database ; still no success.
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Printer was unlinked and tested under a completely different user ccount/system ; issue persists.
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LiDAR sticker clean, aligned, and white reflection visible during calibration process.
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Studio always shows same error: flow result cannot be saved.
Important Finding:
While rechecking the hardware again, I discovered that one of the LiDAR cables had been pinched by a screw behind the rear toolhead plate.
The damage wasn’t immediately visible - the insulation looked okay, but under direct light, the deformation was clear.
I carefully desoldered and resoldered the affected LiDAR wires to restore clean contact - but unfortunately, the exact same behavior remains.
Cables checked:
- LiDAR to Toolhead PCB (FFC) - re-seated and re-soldered.
- Toolhead PCB to Mainboard (FPC) - reseated.
- Power cable (JST) - confirmed: white light present, LiDAR moves correctly.
Open Questions:
- Could a partially damaged FFC/FPC cable cause such silent failure?
- Is there a way to verify Toolhead PCB integrity before replacing more parts?
- Any way to trigger more detailed LiDAR diagnostics or debug logs?
Status with Bambu Support:
Unfortunately, Bambu Support has actually stopped responding to my case, despite multiple follow-ups and shared diagnostic materials (videos, logs, and firmware test results). At this point, I no longer know what else to try.
Given that LiDAR-related changes have been part of recent firmware updates, I suspect that some overlapping issues may be making this harder to isolate. It’s very difficult to tell whether I’m dealing with a hardware fault, a firmware bug, or both.
Available Media:
- I recorded a few videos of the Flow Calibration process. Laser not visible to the eye ; but visible using the X1C camera, as expected.
Has anyone here experienced something similar — or have any further suggestions? I’m completely stuck at this point and would greatly appreciate any ideas or input.
Thanks so much in advance!
Nag.
