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In order to seal a 3D surface and generate a struct file that meets RT (Ready-To-Print) requirements, you can follow these steps:

1. Ensure the 3D surface is properly designed and optimized for 3D printing. This includes checking for overhanging or unsupported areas, wall thickness, and other design considerations.

2. Prepare the 3D surface for sealing by using a mesh repair tool to fix any gaps, holes, or other imperfections.

3. Seal the 3D surface by closing any remaining gaps using a modeling software or a 3D modeling tool. This ensures that the object is completely closed and prevents any printing errors or defects.

4. Check the sealed 3D surface for integrity and compatibility with the 3D printer. Use a slicing software to generate a structural file that meets the RT requirements.

5. Save the sealed and structurally sound 3D surface as a .STL file, ensuring that it is compatible with your printer's software.

6. Load the .STL file into your 3D printer software, and follow the printing instructions to successfully print the object.