¶ XY timing belt
The XY timing belt is an open drive belt with a pitch length of 1442mm. There are 2 XY timing belts in the Bambu Lab X1/X1C printer. They connect the XY motor and the toolhead as well as drive the toolhead to complete movement in the XY direction.
There are two methods to replace the XY belt:
Method 1: Keep the original belt on the printer, then connect the new belt to the old belt end-to-end, and use the old belt to pull the new one through. This method is relatively simple and is more suitable for scenarios such as XY belt wear. For detailed instructions, please refer to the Wiki.
Method 2: Remove the original belt from the printer, then thread the new belt through the printer. This method is more difficult, takes more time, and is better suited for situations like XY belt breakage. For detailed instructions, please refer to the Wiki: Replace the XY Timing Belt | Bambu Lab Wiki
¶ When to use this guide?
- Broken belt
- Belt aging & wear that has affected function
¶ Tools and materials needed
- H1.5 Allen Key
- New XY belt (Usually 1 PCS for broken belt, but 2 PCS for aging & wear)
- Flat-tip tweezers or flat-blade screwdrivers
List of screws used for the parts in this guide
| NO. | Model | Position | Drawing | NO. | Model | Position | Drawing |
| Screw A | BT3*6 | Metal side panels |
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Screw B | ST3*4.5 | Metal side panels, rear panel |
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| Screw C | M3*3 | Glass door |
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Screw D | BT3*5 | Rear panel |
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| Screw E | MG3*12 |
Aux parts cooling fan |
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Screw F | BT3*8 | Tension spring holder |
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| Screw G | M3*6 |
XY tensioner, Extruder |
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Screw H | BT2*5 | Tool head housing, PCBs |
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| Screw I | MG2.5*13 | Cutter lever |
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Screw J | BT2*8 | The timing belt, Y slider cover plate. |
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¶ Safety Warning
IMPORTANT!
It's crucial to power off the printer before performing any maintenance work on the printer and its electronics, including tool head wires, because leaving the printer on while conducting such tasks can cause a short circuit, which can lead to additional electronic damage and safety hazards.
When you perform maintenane or troubleshooting on the printer, you may be required to disassemble some parts, including the hotend. This process can expose wires and electrical components that could potentially short circuit if they come into contact with each other or with other metal or electronic components while the printer is still on. This can damage the electronics of the printer and cause further damage.
Therefore, it's essential to switch off the printer and disconnect it from the power source before doing any maintenance work. This will prevent any short circuits or damage to the printer's electronics. By doing so, you can avoid potential damage to the printer's electronic components and ensure that the maintenance work is performed safely and effectively.
If you have any concerns or questions about following this guide, open a new ticket in our Support Page and we will do our best to respond promptly and provide you with the assistance you need.
¶ Operation guide
Before replacing the new belt, there are some key points that you need to pay attention to.
- The new belt should be oriented the same as the original one.
- Confirm the path of the belt via the original one before replacing it.
- Be slow when passing through the belt, stop and check when there is obvious resistance.
- In some cases, you can bond the new belt and the old belt together on the ends, and use the original belt to guide you install the new belt, which will help you install the belt easier. (Just a suggestion, if you don't want to remove the side panels, you can have a try)
¶ Step 1: Follow the related videos or wiki pages to remove the side panels of the X series.
¶ Step 2 - Replace the XY belts
¶ Some details of the operation
1 - Unlock the belt
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The gap on the belt stopper  |
Pry the stopper of the belt out with flat-tip tweezers or a flat-blade screwdriver. 
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2 - Installing the new belt
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Bend the belt and insert it into the slot  |
Push the belt upward or downward to place with an hex key  |
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The belt fit in the gap  |
Push the fixed block of the belt into the gap, and then lock in 1 screw  |
3 - Installing the tension pulley assembly
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Install the tensioner  |
Screw in 2 screws with metal brackets, but do not tighten them.  |
¶ Calibration step after the operation
After replacing the carbon rods, the belts need to be re-tensioned.
- IMPORTANT: Power OFF the printer first.
- Loosen the 4 screws of the belt-tensioner (but DO NOT remove them), then gently move the toolhead back and forth several times, and finally move it to the rear end of the printer. Then, tighten the 4 screws again. The spring system in the belt-tensioner will tighten the belt to the correct tension.
- IMPORTANT: DO NOT overtighten the belt tensioning screws. Doing that can cause damage and will not provide better results. Simply tighten both screws like any other screws and don't over-torque them.
¶ Verify the functionality
- Connect the power and start the printer;
- Run the device self-test process to confirm that the self-test is OK.
Should you come across any issues, first retrace your steps and check all connections to try again. If problems persist, contact the service team for further assistance.
¶ End Notes
We hope that the detailed guide we shared with you was helpful and informative.
We want to ensure that you can perform it safely and effectively. If you have any concerns or questions regarding the process described in this article, we encourage you to reach out to our friendly customer service team before starting the operation. Our team is always ready to help you and answer any questions you may have.
Click here to open a new ticket in our Support Page.
We will do our best to respond promptly and provide you with the assistance you need.