- Power Off: Always turn off the machine and disconnect the power cord before starting any maintenance.
- Cool Down: Ensure the machine is cool to the touch to avoid burns.
- Electrical Safety: Be cautious when handling electronic components to prevent electric shock.
- Wear Protective Gear: Use safety glasses and gloves to protect against sharp edges and small components.
- Avoid Static Discharge: Ground yourself to prevent static electricity from damaging electronic parts.
- 2.5 mm hex screwdriver
- New servo motor
- Turn off your 3D printer.
- Wait for all components to cool down.
- Unplug the power cord from the outlet.
- Warning: Failure to disconnect the power can result in electric shock.
¶ 1. Unplug from the Mainboard
- Open the rear electronics bay.
- Locate the servo motor wire connected to the mainboard.
- Gently unplug the wire.

- Using the 2.5 mm hex screwdriver, remove the screw holding the probe docking station attached to the servo.
- Pull the docking station towards the front of the machine to remove it.

- Open the lid of the machine to access the interior.
- Locate the four screws securing the servo motor from inside the machine.
- Using the 2.5 mm hex screwdriver, remove the screws while holding the nuts at the back to prevent spinning.
- Carefully slide the servo motor out.
- Caution: Be mindful of any wires or components that may obstruct removal.
- Place the new servo motor into the designated slot.
- Ensure the standoffs and bearing housing are correctly aligned.
- Insert the four screws through the servo motor mounting holes.
- Hand-tighten the nuts at the back just enough to hold the servo in place.
- Important: Do not fully tighten the screws; the servo should still move up and down for calibration.
¶ 4. Reconnecting and Securing Components
- Plug the servo motor wire back into the mainboard, matching the previous connection.
- Securely close the rear door.
¶ Power On and Access the Web Interface
- Plug the power cord back into the machine.
- Turn on the 3D printer.
- Connect to the printer’s web interface from your computer.
- Navigate to the dashboard.
- Go to Macros > System > Calibration > Testing.
- Select “Rotate Z - Probe to Default 0 Position”.
- The servo motor will rotate to the default horizontal position for dock installation.
- Reattach the probe docking station to the servo motor from inside the machine.
- Fully tighten the screw while ensuring the docking station is horizontal.

- If the docking station is not horizontal:
- Navigate to Macros > System > Calibration > Z Probe.
- Select “Adjust Pickup Angle CW” or “Adjust Pickup Angle CCW” to fine-tune the position.
- Magnetically attach the Z-Probe to the left-hand side tool head.
- Manually move the tool head to the docking position.
- Gently move the servo motor up or down until the docking station aligns perfectly with the Z-Probe.
- Once aligned, fully tighten the four screws securing the servo motor.
- Hold the nuts at the back to prevent them from spinning.
- Caution: Ensure not to over-tighten and strip the screws.
- Use the web interface to rotate the servo:
- Go to Macros > System > Calibration > Z Probe.
- Select “Rotate Holder to Set Degree”.
- Adjust using “Adjust Pickup Angle CW” or “Adjust Pickup Angle CCW” until perfectly horizontal.
- Navigate to Macros > System > Calibration > Z Probe.
- Run “Adjust XY - Pickup Position” to calibrate the pickup position.
- Follow any on-screen instructions provided by the calibration script.
- Regular Maintenance: Periodically check the servo motor and docking station for wear.
- Firmware Updates: Keep your printer’s firmware up to date for optimal performance.
- Gentle Handling: Avoid applying excessive force when adjusting components.
- Documentation: Keep a log of maintenance activities for future reference.
By carefully following this guide, you can successfully replace and calibrate the servo motor on your 3D printer, ensuring continued precision and reliability in your printing tasks.