¶ What is the Z timing belt
The Z timing belt is a close drive belt with a pitch length of 1442mm, it is installed at the bottom of the Bambu Lab X1/X1C printer. It connects the Z motor and the Z rods and drives the heatbed to complete the movement in the Z direction.
¶ When to use
- Broken belt
- Belt aging & wear that has affected function
¶ Tools and materials needed
- H1.5 & H 2.0 Allen Key
- New Z belt
¶ Safety warning and Machine state before starting operation
1. Power OFF the printer before doing any maintenance work;
2. In the case where the belt is not broken, lower the heatbed to the bottom base and lock the Z sliders with screws;
3. Take care of the top glass cover plate and the LCD screen.
¶ Operation guide
¶ Step 1 - Removing the LCD screen
Tilt the screen up and press underneath with light force (see picture) to release the buckle and push rightward to unlock the high-resolution LCD screen.
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Press both sides of the FPC connector to unlock the connection and remove the LCD high resolution screen.
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¶ Step 2 - Removing the glass cover plate and turn the printer upside down
Remove the top glass cover plate, flip the printer over and place the bottom side up so that you can see the Z timing belt.
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¶ Step 3 - Unlocking the screws
Release the torsion spring, and remove the black adjustment screw with an H2.0 hex key and the 3 sliver screws with an H1.5 hex key.
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¶ Step 4 - Removing the tension pulley cover and torsion spring
Take off the tension pulley cover, and remove the torsion spring.
¶ Step 5 - Removing the Z tension pulley assembly
Remove the tension pulley assembly. Be careful with the nut inside the assembly, and do not lose it.
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¶ Step 6 - Removing the old Z belt
Now you can take out and remove the Z belt easily.
Warning: Do not rotate the Z belt wheels alone; it will cause the heatbed to tilt.
¶ Step 7 - Installing the new Z belt
Install the new belt to the printer, and place it as shown in the picture below. Make sure that the teeth side is facing inward.
Warning: Do not rotate the Z belt wheels alone; it will cause the heatbed to tilt.
¶ Step 8 - Installing the Z tension pulley assembly
Confirm that the nut is inside the assembly, and then install the tension pulley assembly into place.
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¶ Step 9 - Installing the torsion spring and the pulley cover
Install the torsion spring, noting that the shorter end is on the right side, and then place back the pulley cover.
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¶ Step 10 - Locking screws and tension the spring
Lock the 3 silver screws with an H1.5 hex key to fix the cover, and prefix the black screw with an H2.0 hex key, do not tighten it. Bend the spring to place to make it tense.
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¶ Step 11 - Moving to check the belt and tighten the screw
Move the Z belt back and forth several times to make sure the movement is smooth, and then tighten the black screw.
Note:
In the case of Z belt being broken, you need to confirm that the heatbed is level after the new Z belt was installed. Move the new belt to drive the bed to the bottom base, check that all the 3 sliders touch the bottom base, if there is a gap between the bottom base and the Z slider, then release the tension torsion spring, and rotate the Z belt alone to make the gap gone, and then reinstall the torsion spring.
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¶ Step 12 - Turn the printer upright and replace the glass cover plate
Turn the printer upright again and place back the glass cover plate.
¶ Step 13 - Installing the High Resolution Screen
Pull the FPC out and insert the FPC connector into the port at the back of the high resolution screen LCD by pressing both sides of the FPC connector.
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Insert the excess FPC cable into the printer, mount the LCD high resolution screen into the 4 slots of the printer, and push gently to the left until you hear the buckle click.
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¶ How to verify completion/success
- Connect the power cord and turn on the printer
- Run a Device self-test operation as shown below, and if no errors occur, the replacement was successful.
Should you come across any issues, first retrace your steps and check the installations, especially the direction of the belt and the connection of the LCD screen, and try again. If problems persist, contact the customer support team for further assistance.