[Arco] Heat Bed Levelness Calibration

If your machine’s Heat bed becomes misaligned, you can manually correct the issue by following the steps below.

Tools Required

• 2.5mm Allen wrench
• Protective gloves
• XY Beam alignment brackets (included with the machine upon delivery)
• M3x16 screws x4 
  
• Ruler 
   

Correction Steps

1. Access the Manual Adjustment Page 
   Go to the Tools page, then enter the Manual Adjustment section. Click the Home button to return the machine to its origin position.
2. Raise the Frame 
   Manually raise the frame to a height of 200mm to allow space for the following steps. 
    
    
3. Install the XY Beam Alignment Brackets 
   Use M3x16 screws to attach the XY beam alignment brackets to both sides of the machine. 
   (There is no distinction between left and right brackets—just make sure the arrow symbols on the brackets are facing inward.) 
    
    
    
4. Lower the Frame 
   Lower the XY Beam until it is approximately 10mm above the top of the XY alignment brackets. 
    
   
5. Disable Stepper Motors 
   On the Manual Adjustment page, click Disable Stepper in the upper right corner. 
   
6. Manually Adjust the Z-Axis 
   Turn the Z-axis screws at all four corners counterclockwise to lower the frame until it firmly touches the XY beam alignment brackets and can no longer be rotated downward. 
    
   ⚠️ Important: 
   During this step, do not click any buttons on the touchscreen. 
   If any abnormal behavior or incorrect operation occurs, immediately power off the machine and restart the process from Step 5. 
    
    
   (Wear gloves in this step to avoid direct contact with z-axis lubrication grease.) 
   
7. Raise the Frame Again 
   After alignment, use the machine controls to raise the XY Beam. 
   
8. Remove the Magnetic Print Plate 
   Take off the magnetic print plate to expose the heat bed. 
   
9. Position the Ruler 
   Place a ruler vertically behind the X-axis gantry, ensuring it is perpendicular to the heat bed. 
   
10. Observe the Height 
    Check the height of the heat bed. The goal is to make the values as close as possible. 
    
11. Use an H3 Hex Wrench
    1. Clockwise rotation tightens the screw.
    2. Counterclockwise rotation loosens the screw.
12. Push the Gantry Forward 
    Gently push the X-axis gantry forward to align the height at all four screw positions.
13. Adjust the Screws 
    Turn the screws at each corner to bring the heat bed to a consistent height across all four points. 
     
     
     
     
    
14. Remove the XY Alignment Brackets 
    
15. Run Auto-Leveling 
    Go to the Settings page, click Calibration, and then select Auto-Leveling to recalibrate the machine. 
     
     

That’s it! You’ve successfully completed the frame alignment procedure. 
If you have any questions or need further assistance, feel free to contact our support team. We’re here to help!