diff --git a/other/materials_designer/specific_examples/interface_3d_3d_copper_crystobalite.ipynb b/other/materials_designer/specific_examples/interface_3d_3d_copper_crystobalite.ipynb
index b929f378..fedc583e 100644
--- a/other/materials_designer/specific_examples/interface_3d_3d_copper_crystobalite.ipynb
+++ b/other/materials_designer/specific_examples/interface_3d_3d_copper_crystobalite.ipynb
@@ -339,7 +339,7 @@
     "from utils.jupyterlite import download_content_to_file\n",
     "\n",
     "for idx, interface in enumerate(interfaces):\n",
-    "    download_content_to_file(interfaces, f\"interface_{idx}.json\")"
+    "    download_content_to_file(interface, f\"interface_{idx}.json\")"
    ]
   }
  ],