diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index c3f62f90d4..a015c8624e 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -14839,7 +14839,8 @@ void Plater::export_gcode(bool prefer_removable)
         unsigned int state = this->p->update_restart_background_process(false, false);
         if (state & priv::UPDATE_BACKGROUND_PROCESS_INVALID)
             return;
-        default_output_file = this->p->background_process.output_filepath_for_project("");
+        default_output_file = this->p->background_process.output_filepath_for_project(
+            into_path(this->p->get_project_filename(".3mf")));
     } catch (const Slic3r::PlaceholderParserError &ex) {
         // Show the error with monospaced font.
         show_error(this, ex.what(), true);
@@ -14942,7 +14943,8 @@ void Plater::export_gcode_3mf(bool export_all)
         unsigned int state = this->p->update_restart_background_process(false, false);
         if (state & priv::UPDATE_BACKGROUND_PROCESS_INVALID)
             return;
-        default_output_file = this->p->background_process.output_filepath_for_project("");
+        default_output_file = this->p->background_process.output_filepath_for_project(
+            into_path(this->p->get_project_filename(".3mf")));
     }
     catch (const Slic3r::PlaceholderParserError& ex) {
         // Show the error with monospaced font.
@@ -16089,7 +16091,8 @@ void Plater::send_gcode_legacy(int plate_idx, Export3mfProgressFn proFn, bool us
         unsigned int state = this->p->update_restart_background_process(false, false);
         if (state & priv::UPDATE_BACKGROUND_PROCESS_INVALID)
             return;
-        default_output_file = this->p->background_process.output_filepath_for_project("");
+        default_output_file = this->p->background_process.output_filepath_for_project(
+            into_path(this->p->get_project_filename(".3mf")));
     } catch (const Slic3r::PlaceholderParserError& ex) {
         // Show the error with monospaced font.
         show_error(this, ex.what(), true);