diff --git a/src/cad_to_dagmc/brep_to_h5m.py b/src/cad_to_dagmc/brep_to_h5m.py
index 685c849..6f046ce 100644
--- a/src/cad_to_dagmc/brep_to_h5m.py
+++ b/src/cad_to_dagmc/brep_to_h5m.py
@@ -45,6 +45,7 @@ def mesh_to_h5m_in_memory_method(
     volumes,
     material_tags: typing.Iterable[str],
     h5m_filename: str = "dagmc.h5m",
+    msh_filename=None,
 ) -> str:
     """Converts gmsh volumes into a DAGMC h5m file.
 
@@ -106,7 +107,8 @@ def mesh_to_h5m_in_memory_method(
     GroupedCoords = [
         all_coords[i : i + n].tolist() for i in range(0, len(all_coords), n)
     ]
-
+    if msh_filename is not None:
+        gmsh.write(msh_filename)
     gmsh.finalize()
 
     # checks and fixes triangle fix_normals within vertices_to_h5m
diff --git a/src/cad_to_dagmc/core.py b/src/cad_to_dagmc/core.py
index b82574b..9521821 100644
--- a/src/cad_to_dagmc/core.py
+++ b/src/cad_to_dagmc/core.py
@@ -95,6 +95,7 @@ def export_dagmc_h5m_file(
         min_mesh_size: float = 1,
         max_mesh_size: float = 10,
         mesh_algorithm: int = 1,
+        msh_filename: str = None,
     ):
         assembly = cq.Assembly()
         for part in self.parts:
@@ -128,6 +129,7 @@ def export_dagmc_h5m_file(
             volumes=volumes,
             material_tags=material_tags_in_brep_order,
             h5m_filename=filename,
+            msh_filename=msh_filename,
         )
         return h5m_filename
 
diff --git a/tests/test_h5m_creation.py b/tests/test_file_creation.py
similarity index 97%
rename from tests/test_h5m_creation.py
rename to tests/test_file_creation.py
index 2a38232..dcfe43f 100644
--- a/tests/test_h5m_creation.py
+++ b/tests/test_file_creation.py
@@ -51,8 +51,8 @@ def test_h5m_with_single_volume_list():
 
     my_model = CadToDagmc()
     my_model.add_stp_file(filename="tests/single_cube.stp", material_tags=["mat1"])
-    my_model.export_dagmc_h5m_file(filename=h5m_file)
-
+    my_model.export_dagmc_h5m_file(filename=h5m_file, msh_filename="test.msh")
+    assert Path("test.msh").is_file()
     assert get_volumes_and_materials_from_h5m(h5m_file) == {1: "mat:mat1"}