diff --git a/src/libslic3r/Format/3mf.cpp b/src/libslic3r/Format/3mf.cpp
index 894de0549b..7ca0bceb97 100644
--- a/src/libslic3r/Format/3mf.cpp
+++ b/src/libslic3r/Format/3mf.cpp
@@ -2550,11 +2550,9 @@ ModelVolumeType type_from_string(const std::string &s)
             stream << " <" << METADATA_TAG << " name=\"Copyright\">" << "</" << METADATA_TAG << ">\n";
             stream << " <" << METADATA_TAG << " name=\"LicenseTerms\">" << "</" << METADATA_TAG << ">\n";
             stream << " <" << METADATA_TAG << " name=\"Rating\">" << "</" << METADATA_TAG << ">\n";
-            std::string date = Slic3r::Utils::utc_timestamp(Slic3r::Utils::get_current_time_utc());
-            // keep only the date part of the string
-            date = date.substr(0, 10);
-            stream << " <" << METADATA_TAG << " name=\"CreationDate\">" << date << "</" << METADATA_TAG << ">\n";
-            stream << " <" << METADATA_TAG << " name=\"ModificationDate\">" << date << "</" << METADATA_TAG << ">\n";
+            // Orca: PRIVACY: do not store creation & modification date in 3mf
+            stream << " <" << METADATA_TAG << " name=\"CreationDate\">" << "</" << METADATA_TAG << ">\n";
+            stream << " <" << METADATA_TAG << " name=\"ModificationDate\">" << "</" << METADATA_TAG << ">\n";
             stream << " <" << METADATA_TAG << " name=\"Application\">" << SLIC3R_APP_KEY << "-" << SLIC3R_VERSION << "</" << METADATA_TAG << ">\n";
             stream << " <" << RESOURCES_TAG << ">\n";
             std::string buf = stream.str();
diff --git a/src/libslic3r/Format/bbs_3mf.cpp b/src/libslic3r/Format/bbs_3mf.cpp
index 38f4f34307..72c6d54ca7 100644
--- a/src/libslic3r/Format/bbs_3mf.cpp
+++ b/src/libslic3r/Format/bbs_3mf.cpp
@@ -6509,7 +6509,7 @@ void PlateData::parse_filament_info(GCodeProcessorResult *result)
                 metadata_item_map[BBL_MODEL_NAME_TAG]           = xml_escape(name);
                 metadata_item_map[BBL_ORIGIN_TAG]               = xml_escape(origin);
                 metadata_item_map[BBL_DESIGNER_TAG]             = xml_escape(user_name);
-                metadata_item_map[BBL_DESIGNER_USER_ID_TAG]     = user_id;
+                metadata_item_map[BBL_DESIGNER_USER_ID_TAG]     = ""; // Orca: PRIVACY: do not store BBL user id in 3mf
                 metadata_item_map[BBL_DESIGNER_COVER_FILE_TAG]  = xml_escape(design_cover);
                 metadata_item_map[BBL_DESCRIPTION_TAG]          = xml_escape(description);
                 metadata_item_map[BBL_COPYRIGHT_NORMATIVE_TAG]  = xml_escape(copyright);
@@ -6521,11 +6521,9 @@ void PlateData::parse_filament_info(GCodeProcessorResult *result)
                     metadata_item_map[BBL_REGION_TAG]   = region_code;
                 }
 
-                std::string date = Slic3r::Utils::utc_timestamp(Slic3r::Utils::get_current_time_utc());
-                // keep only the date part of the string
-                date = date.substr(0, 10);
-                metadata_item_map[BBL_CREATION_DATE_TAG] = date;
-                metadata_item_map[BBL_MODIFICATION_TAG]  = date;
+                // Orca: PRIVACY: do not store creation & modification date in 3mf
+                metadata_item_map[BBL_CREATION_DATE_TAG] = "";
+                metadata_item_map[BBL_MODIFICATION_TAG]  = "";
                 //SoftFever: write BambuStudio tag to keep it compatible 
                 metadata_item_map[BBL_APPLICATION_TAG] = (boost::format("%1%-%2%") % "BambuStudio" % SoftFever_VERSION).str();
             }