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How to fix CR Touch and BLTouch homing failure

How to fix CR Touch and BLTouch homing failure

August 03 , 2023 0

Automated leveling systems widely used in 3D printing include CR Touch and BLTouch, which probe the bed before each print and then adjust the nozzle height to adjust for any bed unevenness. While they are very useful, sometimes these systems can malfunction during homing, which can lead to print-related issues such as layer shift and poor bed adhesion. Next we will explain in-depth about homing failures with the CR Touch and BLTouch, which we hope will help you in your 3D printing endeavors!

What is the BL/CR Touch Sensor?

The BLTouch sensor is a critical 3D printer sensor for automatic leveling. The mechanism involves using a probe to contact the bed at various points to obtain an accurate map of the surface. This map guides the Z-axis alignment during the printing process to ensure

proper bed attachment.

Similarly, the CR Touch Sensor is used for auto-leveling, but with a different sensor type.The CR Touch Sensor produces an accurate map of the contours at several points by pressing a metal pin against the bed. This data guides how the Z-axis adjustment is adjusted

during printing to ensure optimal bed adhesion for printing

What causes the CR Touch and BLTouch to fail to home?

There are four main reasons why the CR Touch and BLTouch sensors will not home properly:

1. Incorrect wiring: Loose or damaged wiring can cause the sensor to malfunction and not home.

2. Inaccurate Sensor Position: Correct positioning of the sensor is important to accurately measure the bed or homing problems may result.

3. Sensor failure: The sensor itself may fail due to damage or wear.

4. Bed surface problems: If the bed surface is uneven or unclean, the sensor may not be able to get an accurate reading, resulting in a homing error.

How to solve the CR Touch and BLTouch homing failure?

1. Check the wiring

The first step in resolving a homing problem is to check the wiring. Make sure all connections are secure and there is no visible damage. If damaged wires are found, they must be repaired or replaced.

2. Check Sensor Location

Next, verify the location of the sensor. Verify that the sensor is accurately positioned and is not blocked by any obstacles. If the sensor is not placed in the proper location, it will need to be adjusted.

3. Test the Sensor

After ensuring that the wiring and sensor location are correct, the sensor must be tested. To test, manually bring the sensor close to the bed and check if it triggers properly. If the sensor does not trigger, it may be defective and need to be replaced.

4. Clean the bed

If the sensor works properly but homing is still unsuccessful, the bed surface may be the problem. Make sure to remove any debris or dirt from the bed surface. Alternatively, use a spirit level to verify that the bed surface is level.

5. Adjusting the Sensor

If the bed surface is clean and level and the sensor is still unable to achieve proper homing, the sensitivity of the sensor may need to be adjusted. You can adjust the height of the sensor or change its trigger point to obtain higher sensor sensitivity.

6. Replace the sensor

If the previously mentioned solutions do not work, it is recommended to replace the sensor. Make sure to purchase a sensor that is more compatible with the printer model.

Conclusion

The CR Touch and BLTouch sensor homing failure must be very disturbing to everyone, but the problem is not insurmountable, the above solutions can solve and eliminate most of the problems you encountered. If you have any questions, please feel free to leave a

comment and we will continue to share 3D printing tips for you in the next issue!