Function repair 

pub fn repair(
    input: PathBuf,
    output: PathBuf,
    epsilon: f32,
    fixes: Vec<RepairType>,
) -> Result<()>

Repair mesh geometry in a 3MF file.

Performs geometric processing to improve printability:

• Vertex stitching (merge vertices within epsilon tolerance)
• Degenerate triangle removal
• Duplicate triangle removal
• Orientation harmonization (consistent winding)
• Island removal (disconnected components)
• Hole filling (boundary loop triangulation)

Arguments

• input - Input 3MF file path
• output - Output 3MF file path
• epsilon - Vertex merge tolerance for stitching
• fixes - List of repair types to perform

Errors

Returns an error if parsing or writing fails.