The leveling sensor (proximity switch) is located on the right side inside the print head.
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¶ 1. Tools:
S2.5 Allen Key
Flathead Screwdriver
Open-end wrench
¶ 2. Check the Proximity Switch
Troubleshooting Steps:
¶ Step 1: Start the printer
Insert the cable and turn on the printer.
¶ Step 2: Check the proximity switch
After the printer starts up normally, use an open-end wrench to place the bottom of the proximity switch
on top and observe whether the blue LED light turns on.
¶ 3. Check the Distance Between the Proximity Switch and Nozzle
Troubleshooting Steps:
¶ Step 1: Turn off the printer
Before troubleshooting, make sure to turn off the printer and disconnect the power to ensure safe operations.
¶ Step 2: Check the distance between the proximity switch and the nozzle
①Follow the diagram to move the belt, lower the X-axis module, and stop pulling when the print head module is close to the heated bed.
②Place an open-end wrench under the proximity switch (ensure its position does not interfere with the nozzle).
Then, pull the belt again according to the previous diagram, allowing the proximity switch to make contact with the open-end wrench.
I. If, when pulling the belt, the proximity switch touches the open-end wrench but there is still a gap between the nozzle and the heated bed,
the distance between the proximity switch and the heated bed may be too close. In this case,
significant adjustments to "Z Offset" (Z-axis compensation value) may be needed to ensure tight adhesion of the first layer to the heated bed.
II. If, when pulling the belt, the nozzle touches the heated bed first,
it may indicate that the distance between the proximity switch and the heated bed is too large,
and the issue is that the nozzle may hit the heated bed first, preventing the proximity switch from triggering.
III. The correct situation is that when the proximity switch touches the open-end wrench, the nozzle should also touch the heated bed.
¶ 4. Tighten the Screws on the Coupler
If the screws on the coupler are not properly tightened, it may cause the motor to fail to drive the X-axis module during leveling, resulting in a leveling error.
Troubleshooting Steps:
¶ Step 1: Tighten the screws on the coupler
Use the S2.5 Allen Key to tighten the 2 screws on both sides of the coupler that fix the motor and lead screw.
¶ 5. Poor Cable Contact
Troubleshooting Steps:
¶ Step 1: Turn off the printer
Before inspecting the circuits, please ensure the printer is turned off and disconnected from power to ensure safe operations.
¶ Step 2: Tilt the printer
Tilt the printer so that its bottom faces you.
¶ Step 3: Disassemble the mainboard bottom cover
①Use the S2.5 Allen Key to unscrew the 4 screws fixing the mainboard bottom cover.
②Disconnect the FAN2 fan cable from the mainboard and place the mainboard bottom cover aside.
¶ Step 4: Replug the cables
①Use the "Cross" screwdriver to gently insert and pry open the fixed cable buckle accessories on both sides of the print head module.
②Replug both ends of the cable harness of the print head.
Note: If there is glue on the appearance, gently peel off the glue before unplugging the cable.
If the automatic leveling process encounters abnormal errors and these errors occur at a specific or random position, it is likely due to damage to the print head cable harness.
The possible reason is that a wire in the print head cable harness is damaged or poorly connected, which may cause tension in the cable harness during leveling, leading to poor contact.