Modify 3mf generation script and generate new 3mf files

scripts/generate_3mf_files.py

@@ -1,6 +1,7 @@
 #!/usr/bin/freecadcmd
 
 import os
+import shutil
 import subprocess
 import FreeCAD as App  # type: ignore
 import Mesh  # type: ignore
@@ -19,7 +20,7 @@ git_short_hash = subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD']
 
 # Remove the existing 3MF directory if it exists and create a new one
 if os.path.exists(printed_3mf_dir):
-    os.rmdir(printed_3mf_dir)
+    shutil.rmtree(printed_3mf_dir, ignore_errors=True)
 
 os.makedirs(printed_3mf_dir, exist_ok=True)