diff --git a/backend/app/services/render_blender.py b/backend/app/services/render_blender.py
index 8545739..613f640 100644
--- a/backend/app/services/render_blender.py
+++ b/backend/app/services/render_blender.py
@@ -372,6 +372,8 @@ def render_turntable_to_file(
 
     # 2. Render frames with Blender
     frames_dir = output_path.parent / f"_frames_{output_path.stem}"
+    if frames_dir.exists():
+        _shutil.rmtree(frames_dir, ignore_errors=True)
     frames_dir.mkdir(parents=True, exist_ok=True)
     output_path.parent.mkdir(parents=True, exist_ok=True)
 
@@ -600,6 +602,8 @@ def render_cinematic_to_file(
 
     # 2. Render frames with Blender
     frames_dir = output_path.parent / f"_frames_{output_path.stem}"
+    if frames_dir.exists():
+        _shutil.rmtree(frames_dir, ignore_errors=True)
     frames_dir.mkdir(parents=True, exist_ok=True)
     output_path.parent.mkdir(parents=True, exist_ok=True)