- 3D printers
- 3D printer
0300-0D00-0001-000B
Bambu Lab 0300-0D00-0001-000B on a 3D printer: Z axis stuck
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Bambu Lab HMS 0300-0D00-0001-000B means the Z axis motor met an abnormal force while raising the bed and stopped. Check that nothing rubs the bed or the Z sliders and run homing again before taking anything apart.
Safety first
Stop and check this first
- Bed and Z axis checks are done with the printer stopped. If you raise the bed by hand to look at the cable, do it slowly and with the nozzle cold. Laying the printer on its side is a job for the technician.
- Do not disable or bypass the thermal protection or change the firmware to clear the alert: it is what cuts the heat when the temperature does not add up. Do not open the printer's power supply or mains board: anything at mains voltage is for the service team.
Safe checks you can perform
- Plate and bed free of bulges and objects
- Z sliders and lead screw
- Purge chute gap and heatbed cable
- AMS hub or buffer screws
Leave these tasks to a qualified professional
- Do not attempt this professional task: Bed adjustment and manual levelling
- Do not attempt this professional task: Ticket with video and log
- Do not attempt this professional task: Bottom and Z motor check
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Bed adjustment and manual levelling
What they doIf nothing fixes it, the technician loosens the 6 marked screws, pushes the bed toward the front door, retightens them and does a manual bed levelling.
They must show youa correct homing afterwards.
In writingthe adjustment made.
Ticket with video and log
What they doIf the alert stays, Bambu Lab asks you to record the bed and toolhead movement during homing, leave the printer idle for 10 minutes and send the video and log file in a ticket.
They must show youthe ticket reply.
In writingticket number and diagnosis.
Bottom and Z motor check
What they doThe technician lays the printer on its side, checks that nothing jams the Z motor and belt pulley and pulls the Z belt to see whether the bed moves smoothly; on the A1, if the toolhead stutters, the Z motor is replaced.
They must show yousmooth movement after cleaning.
In writingwhat was found and whether the motor was replaced.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Plate and bed free of bulges and objects
- Who:
- you.
- How:
- with the printer stopped, light the bed and plate from the side and look for bulges or objects; also make sure the nozzle tip is clean and the two hotend screws are tight.
- Result that matters:
- a clean, rigid surface.
- If there is a bulge or object:
- remove it or replace the plate.
- If all is fine:
- check the sliders.
- Evidence to keep:
- photos of the plate.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
Z sliders and lead screw
- Who:
- you.
- How:
- look at the surface of the Z axis sliders and the top of the lead screw for debris, and whether any bearing is sticking out.
- Result that matters:
- whether there is debris or a raised bearing.
- If there is debris:
- clean it.
- If a bearing sticks out:
- follow Bambu Lab's guide to reseat it or ask for help.
- Evidence to keep:
- photos of the bearings.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
Purge chute gap and heatbed cable
- Who:
- you.
- How:
- raise the bed slowly and check there is 1 to 2 mm between bed and purge chute and between plate and side linings, and that the heatbed cable next to the lead screw stays slack.
- Result that matters:
- whether anything rubs or the cable is tight.
- If it rubs or is tight:
- follow Bambu Lab's interference or cable guides.
- If everything is clear:
- check the hub or buffer screws if you have one.
- Evidence to keep:
- photo of the cable with the bed raised.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
AMS hub or buffer screws
- Who:
- you, if you have an AMS hub or filament buffer.
- How:
- loosen the two mounting screws by one or two turns, as Bambu Lab suggests, and run homing again.
- Result that matters:
- whether homing completes without error.
- If it completes:
- the screws were too tight.
- If not:
- record the homing and go to support.
- Evidence to keep:
- video of the homing.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- 3D printers
- Brand
- Bambu Lab
- Product type
- 3D printer
Known code variants
- 0300 0D00 0001 000B
- Bambu Lab eje Z atascado
- Bambu Lab Z axis stuck
- HMS_0300-0D00-0001-000B
What it means
Bambu Lab explains the alert appears when, as the Z axis moves up, the motor detects an abnormally large force that stops it spinning. The possible causes it lists include objects jamming the motor or the Z belt pulleys, debris on the sliders or a raised bearing, the bed rubbing the purge chute, a tight heatbed cable, overtightened AMS hub screws, abnormal slider tolerance or a force sensor that does not detect the nozzle touching. It warns there may be other causes.
Warnings and stop conditions
- Mediumeditorial warning
Bed and Z axis checks are done with the printer stopped. If you raise the bed by hand to look at the cable, do it slowly and with the nozzle cold. Laying the printer on its side is a job for the technician.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
- Criticaleditorial warning
Do not disable or bypass the thermal protection or change the firmware to clear the alert: it is what cuts the heat when the temperature does not add up. Do not open the printer's power supply or mains board: anything at mains voltage is for the service team.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
Symptoms and causes
Probable causes · in order
- Debris on the sliders or lead screwCommon
Debris on the Z axis slider or at the top of the lead screw, or a linear bearing sticking out, holds back the rising bed.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
- Bed rubbing the purge chute or side liningsPossible
If the bed or plate rubs the purge chute or the side linings, the Z axis is slowed; there should be a 1 to 2 mm gap.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
- Tight heatbed cablePossible
If the heatbed signal cable is pulled tight as the bed rises, it drags the bed and the motor detects the load.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
- AMS hub or buffer screwsPossible
With an AMS hub or filament buffer, overtightened mounting screws can jam the Z axis near the nozzle.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
- Abnormal force sensorLess common
If the force sensor does not detect the nozzle touching, the bed keeps rising until the Z motor stops on load.
Evidence: Bambu Lab Wiki: HMS_0300-0D00-0001-000B: The Z axis motor seems to be stuck when moving. Please check if there is any foreign matter on the Z sliders or Z timing belt wheels.
Virtual technician
Does 0300-0D00-0001-000B still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Bambu Lab Wiki: HMS Home Page, List of Error Codes for Bambu Lab 3D Printers
Bambu Lab · 2026 · official_doc
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