diff --git a/src/libslic3r/Format/3mf.cpp b/src/libslic3r/Format/3mf.cpp
index 200e6a490..c85e4bcd3 100644
--- a/src/libslic3r/Format/3mf.cpp
+++ b/src/libslic3r/Format/3mf.cpp
@@ -2905,7 +2905,6 @@ namespace Slic3r {
                                     stream << prefix << SOURCE_OFFSET_X_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(0) << "\"/>\n";
                                     stream << prefix << SOURCE_OFFSET_Y_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(1) << "\"/>\n";
                                     stream << prefix << SOURCE_OFFSET_Z_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(2) << "\"/>\n";
-                                    stream << prefix << SOURCE_OFFSET_Z_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(2) << "\"/>\n";
                                 }
                                 if (volume->source.is_converted_from_inches)
                                     stream << prefix << SOURCE_IN_INCHES << "\" " << VALUE_ATTR << "=\"1\"/>\n";