diff --git a/backend/app/api/routes/printers.py b/backend/app/api/routes/printers.py
index 3f924859f..fa890f1d2 100644
--- a/backend/app/api/routes/printers.py
+++ b/backend/app/api/routes/printers.py
@@ -595,6 +595,15 @@ async def get_printer_cover(
         possible_filenames.append(f"{subtask_name}.gcode.3mf")
         possible_filenames.append(f"{subtask_name}.3mf")
 
+    # Also try with spaces converted to underscores (Bambu Studio may normalize filenames)
+    if " " in subtask_name:
+        normalized = subtask_name.replace(" ", "_")
+        if normalized.endswith(".3mf"):
+            possible_filenames.append(normalized)
+        else:
+            possible_filenames.append(f"{normalized}.gcode.3mf")
+            possible_filenames.append(f"{normalized}.3mf")
+
     # Build list of all remote paths to try
     remote_paths = []
     for filename in possible_filenames:
@@ -1574,6 +1583,15 @@ async def get_printable_objects(
                 possible_filenames.append(f"{subtask_name}.gcode.3mf")
                 possible_filenames.append(f"{subtask_name}.3mf")
 
+            # Also try with spaces converted to underscores (Bambu Studio may normalize filenames)
+            if " " in subtask_name:
+                normalized = subtask_name.replace(" ", "_")
+                if normalized.endswith(".3mf"):
+                    possible_filenames.append(normalized)
+                else:
+                    possible_filenames.append(f"{normalized}.gcode.3mf")
+                    possible_filenames.append(f"{normalized}.3mf")
+
             # Download 3MF from printer
             temp_path = settings.archive_dir / "temp" / f"objects_{printer_id}_{possible_filenames[0]}"
             temp_path.parent.mkdir(parents=True, exist_ok=True)
diff --git a/backend/app/main.py b/backend/app/main.py
index 5f534411e..e36d5cc89 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -1002,6 +1002,13 @@ async def on_print_start(printer_id: int, data: dict):
                 possible_names.append(f"{fname}.gcode.3mf")
                 possible_names.append(f"{fname}.3mf")
 
+        # Also try with spaces converted to underscores (Bambu Studio may normalize filenames)
+        space_variants = []
+        for name in possible_names:
+            if " " in name:
+                space_variants.append(name.replace(" ", "_"))
+        possible_names.extend(space_variants)
+
         # Remove duplicates while preserving order
         seen = set()
         possible_names = [x for x in possible_names if not (x in seen or seen.add(x))]
@@ -1085,7 +1092,10 @@ async def on_print_start(printer_id: int, data: dict):
                         if f.get("is_directory"):
                             continue
                         fname = f.get("name", "")
-                        if fname.endswith(".3mf") and search_term in fname.lower():
+                        # Normalize both for comparison (spaces and underscores are equivalent)
+                        fname_normalized = fname.lower().replace(" ", "_")
+                        search_normalized = search_term.replace(" ", "_")
+                        if fname.endswith(".3mf") and search_normalized in fname_normalized:
                             logger.info(f"Found matching file in {search_dir}: {fname}")
                             temp_path = app_settings.archive_dir / "temp" / fname
                             temp_path.parent.mkdir(parents=True, exist_ok=True)