Prepare Scanned Clay Model for Printing

I already have a high-resolution scan of an artistic clay sculpture, about 20–30 cm in its longest dimension. All I need now is a clean, print-ready file for my Bambu 3D printer. Important that the quality and details remain as is

Here is what’s important to me:
• Keep the exterior exactly as captured; I am not looking for extra smoothing, text, or patterns.
• Hollow the interior so that it follows the current inner contours—think a consistent shell rather than a solid block.
• Trim the rough edges left by the scan so that the piece sits flat and slices without errors.
• Optimise the mesh so it is watertight and friendly to PETG slicing on Bambu Studio (STL or 3MF is fine).

Once you’re done, a quick screen grab of the model in cross-section will let me verify wall thickness before I hit print.