hi, @LHW2008 from your description, you can try the following methods: Please replace the original spool first, and then print the test (check whether the spool interferes with the BL-touch line); Let the customer check whether the BL-touch wire is damaged, and then separate the BL-touch from other wires (do not tie them together), and then check whether the BL-touch can work properly; Check whether the BL-Touch automatically shrinks twice after it is turned on. If not, replace it with a new one. If the issue still exists, please send an email to cs@creality.com ann attach videos in detail. There will be the professionals to help you.