Step 1: Remove the Bottom Cover Plate

1. Check the Z-axis Motor Wire:
   1. Ensure the Z-axis motor wire is not loose.
   2. Check for any damage to the motor cable.
   3. If everything appears normal, unplug and replug the motor wire, then run the Z-axis again to see if it functions properly.

Step 2: Inspect the Z-axis Wire Rod and Coupling

1. Check for Disconnection or Looseness:
   1. Verify if the Z-axis wire rod and coupling have come out of the slot where the Z-axis does not move.
   2. Manually move the Z-axis to check for any looseness.
   3. If loose, proceed with the following steps:

Disassemble:

• Pull out the Z-axis motor wire.
• Remove the 8 Z-axis fixing bolts and take out the gantry assembly from the base.

Remove the bottom cover plate of the Z-axis.

Move the Z-axis wire rod down to expose the coupling.

Re-secure the fixing screws at the coupling.

Check if the motor or wire rod is loose; if so, tighten the screws again.

1. Reassemble:
   1. After fixing it, reassemble it in the reverse order of disassembly.

Step 3: Check for Motor Damage

1. If issues persist: It is possible that the motor is damaged and may need replacement.

Step 4: Contact Support

1. For further assistance: If the above steps do not resolve the issue, please contact us at us.