¶ 1. Tools
M2.0/2.5/3.0/4.0 Allen Key
Several Cable Ties
Open-end Wrench
Combination Pliers
Phillips Screwdriver
¶ 2. Disassembly Steps:
¶ Step 1: Power Off the Machine
Before starting the Y-axis guide rail replacement, make sure you have a relatively spacious worktable or desk for disassembly. It's crucial to power off the machine and disconnect the power source for your safety.
¶ Step 2: Remove the Touch Screen Cable
Hold the latch on both sides of the touch screen cable to remove it, and then take the cable out of the slot.
¶ Step 3: Disassemble the Base Plastic Parts
① Use the M2.5 Allen Key to unscrew the 2 screws fixing the bottom plastic parts;
② Use a Phillips screwdriver to pry open the plastic parts along the indicated direction;
③ Take out the touch screen cable from the plastic parts;
④ Unplug the FAN2 fan cable on the mainboard and set aside the plastic parts.
¶ Step 4: Disconnect Wires Related to the Heated Bed from the Mainboard
Loosen and remove the terminal of the heated bed heating wire using a Phillips screwdriver.
Disconnect the heated bed NTC wire, offset measurement switch wire, and vibration sensor wire and remove them from their respective slots.
Use combination pliers to cut the Cable Ties holding the wires in place. Note: If there's any adhesive on the wires, gently remove it before unplugging them.
¶ Step 5: Remove the Y-axis Belt Tensioner
①Rotate the red knob on the Y-axis belt tensioner counterclockwise to remove it.
②Move the heated bed to the frontmost position and use a wrench or another tool to move and remove the belt copper clip fixed on the heated bed.
③Use an M2.0 Allen key to loosen and remove the two screws securing the tensioner.
④Remove the tensioner and then take the belt out from the tensioner pulley.
¶ Step 6: Remove the Belt
Move the heated bed to the position behind the motor at the back of the printer.
①Use a wrench or a suitable tool to move the belt copper clip fixed on the heated bed to the right and remove the clip.
②When removing the belt, be careful as the copper clip may get stuck slightly. Adjust its position gently before proceeding.
③Slowly pull the belt out.
④As you pull it out, be cautious as the other end of the copper clip may catch on the edge of the guide rail. Carefully adjust its position to ensure smooth removal.
¶ Step 7: Remove the Y-axis Motor
①Disconnect the Y-axis motor cable.
②Use an M2.5 Allen key to remove the four screws securing the Y-axis motor.
③ps: The screws marked in yellow secure the ground wire; please be mindful of this during subsequent installation.
¶ Step 8: Remove the Y-axis Motor Bracket
Use an M3.0 Allen key to remove the two screws securing the Y-axis motor bracket. Note that the Y-axis limit switch wire and some Cable Ties holding the wires are still connected to the bracket. After removal, set the bracket aside to avoid interfering with subsequent assembly.
¶ Step 9: Remove the Heated Bed Assembly
In previous steps, we already disconnected the wires related to the heated bed assembly. Now, gently slide the heated bed out of the Y-axis guide rail. Place the heated bed aside for later installation.
¶ Step 10: Remove the Y-axis Guide Rail
①Please refer to the diagram below for the correct placement of the machine, ensuring that the bottom of the machine is facing directly toward you for the subsequent disassembly steps.
②Use an M4.0 Allen key to remove the six screws securing the Y-axis guide rail.
¶ 3. Installation Steps:
¶ Step 1: Install the Y-axis Guide Rail
Retrieve the new Y-axis guide rail and align it with the screw holes on the base. Using an M4.0 hexagonal wrench, first pre-lock the middle 4 screws of M5*30mm, then pre-lock the 2 screws at the bottom of M5*50mm, and finally tighten the screws.
¶ Step 2: Install the Heated Bed Assembly
Position the machine correctly and slide the heated bed assembly onto the new guide rail. If it gets stuck, use an open-end wrench to adjust the hexagonal eccentric pillars underneath.
¶ Step 3: Install the Y-axis Motor Bracket
Align the Y-axis motor bracket with the screw holes on the Y-axis guide rail. Using an M3.0 hexagonal wrench, tighten the 2 screws to secure the Y-axis motor bracket. Ensure that the screws are securely fastened to firmly attach the motor bracket to the guide rail.
¶ Step 4: Install the Y-axis Motor
①Align the Y-axis motor with the screw holes on the Y-axis motor bracket, and use an M2.5 hexagonal wrench to tighten the 4 screws to secure the Y-axis motor.(Note: When tightening the screws in the yellow marked position, make sure to connect the ground wire before tightening the screws).
②Connect the Y-axis motor cable.
¶ Step 5: Install the Belt
First, move the heated bed to the rear position of the printer's base, and take out the belt that was removed earlier:
①Thread one end of the belt through the hole in the Y-axis motor bracket. Be aware that the belt's copper clip may catch slightly. You can gently adjust its position and then thread it through the bracket.
②Use an appropriate tool to secure the copper clip of the belt to the sheet metal. Once secured, move the clip to the left into the groove.
③Thread the other end of the belt through the front.
¶ Step 6: Install the Y-axis Belt Tensioner
①Thread one end of the belt around the pulley inside the tensioner and mount the pulley on the tensioner casing.
②Use an appropriate tool to secure the copper clip of the belt to the sheet metal. Once secured, move the clip to the right into the groove.
③Use an M2.0 Allen key to tighten the left and right two screws to secure the tensioner.
④Rotate the red knob clockwise to tighten it.
¶ Step 7: Connect the Wires
Insert the heated bed heating wire into the terminal and use a Phillips screwdriver to secure it. Then, insert the heated bed NTC wire, offset measurement switch wire, and vibration sensor wire into their respective positions and secure the wires in place using Cable Ties passed through the position iron pieces. Tighten the Cable Ties, and finally, cut off any excess tie straps with combination pliers.
¶ Step 8: Install the Base Plastic Parts
First, plug the FAN2 fan cable into the FAN2 port on the motherboard. Then, thread the control screen cable through the plastic piece's cable hole and mount the plastic piece on the base. Retrieve the two screws removed earlier and use an M2.5 Allen key to tighten them, securing the plastic piece to the base.
¶ Step 9: Install the Control Screen Cable
①Thread the cable through the cable slot.
②Press the terminals on both sides of the control screen cable and insert the cable into the control screen port.
¶ 4. Adjust Belt Tension:
Rotate the Y-axis tensioner knob clockwise until it's tight, then rotate it counterclockwise for one turns.
¶ 5. Adjust Heated Bed Movement:
Use an open-end wrench to adjust the hexagonal eccentric pillar on the right side of the heated bed until the bed can move smoothly and without noticeable wobbling when moved left and right. For a more detailed visual guide, refer to the Kobra 2 leveling guide video. The video demonstrates the adjustment steps starting at 57 seconds. Follow the video instructions to ensure smooth and stable heated bed movement.
Video Link: https://www.youtube.com/watch?v=zF102Zceeok
¶ 6. Module Calibration:
After replacing the Y-axis guide rail, In the main interface, click on the "Tools" icon ➜ "Control" icon ➜ "Module Calibration" ➜ "Position Calibration." The machine will automatically perform detection and pause near the top of the calibration module. You could adjust the nozzle to the center position of the calibration module using the distance units and X/Y axis movement direction on the interface. Once done, click "Save," and finally, perform the automatic leveling again. Finally, perform auto-leveling again and manually compensate for Z-axis offset values during printing to avoid printing in air.
¶ 7. Post-Maintenance:
We recommend checking the Y-axis dual-axis guide rail every month to ensure it's clean and free from foreign objects. This helps maintain the smooth operation of the guide rail, ensuring the stability and precision of the machine.
¶ Maintenance Steps:
¶ Step 1: Check the Guide Rails
Power off the machine and disconnect the power. Use a lint-free cloth or a soft brush to inspect the guide rail's surface for dust, debris, or other foreign objects. If any are present, gently remove them. Check the guide rail's motion path for smooth operation without stuttering or resistance. Move the Y-axis gently by hand and observe the guide rail's movement.
¶ Step 2: Clean the Guide Rails
If you find a significant amount of dust or debris on the guide rail, you can perform the following cleaning steps:
Use an air gun or a hairdryer to gently blow away dust from the guide rail's surface. If using an air gun, press the trigger gently. Be careful not to blow dust into other components or damage electronic parts.
¶ Step 3: Lubricate the Guide Rails
Apply a small amount of lubricating grease to the guide rail's shafts on both sides of the Y-axis. Then, gently move the heated bed to evenly distribute the grease on the guide rail.
¶ Step 4: Test
After maintenance, gently move the heated bed and the print head module by hand to check for any binding or wobbling. If any issues are detected, refer to the Kobra 2 leveling guide video to readjust the hexagonal eccentric pillars. Reconnect the power and turn on the machine. Run a test print to ensure smooth Y-axis movement with no abnormal resistance or noise. Make sure the guide rails are clean and working correctly.
If the above steps do not provide assistance or if you encounter any other issues during subsequent use, we recommend that you create a support ticket. The after-sales engineers will assist you in finding a solution to the problem(Reply time :1 working day)
Please click this link to submit your ticket: