Thank you for your suggestion, but many times the recording in SCDM does not respond, I guess it may be related to the complexity of the model. I have already solved it, I changed the way of thinking, the pipe in the main body is not processed into a hollow, when the scanning path is generated, I choose not to merge, and then cut off the extra parts on both sides, and I get what I want perfectly. The outer body of the body, the inner is a solid tube
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