diff --git a/python/damask/_grid.py b/python/damask/_grid.py
index 200541cf5..5457643ee 100644
--- a/python/damask/_grid.py
+++ b/python/damask/_grid.py
@@ -81,26 +81,32 @@ class Grid:
         """
         message = []
         if np.any(other.cells != self.cells):
-            message.append(util.deemph(f'cells    a b c:     {util.srepr(other.cells," x ")}'))
-            message.append(util.emph(  f'cells    a b c:     {util.srepr( self.cells," x ")}'))
+            message.append(util.deemph(f'cells    x y z: {util.srepr(other.cells," x ")}'))
+            message.append(util.emph(  f'cells    x y z: {util.srepr( self.cells," x ")}'))
 
         if not np.allclose(other.size,self.size):
-            message.append(util.deemph(f'size     x y z:     {util.srepr(other.size," x ")}'))
-            message.append(util.emph(  f'size     x y z:     {util.srepr( self.size," x ")}'))
+            message.append(util.deemph(f'size     x y z: {util.srepr(other.size," x ")}'))
+            message.append(util.emph(  f'size     x y z: {util.srepr( self.size," x ")}'))
 
         if not np.allclose(other.origin,self.origin):
-            message.append(util.deemph(f'origin   x y z:     {util.srepr(other.origin,"   ")}'))
-            message.append(util.emph(  f'origin   x y z:     {util.srepr( self.origin,"   ")}'))
+            message.append(util.deemph(f'origin   x y z: {util.srepr(other.origin,"   ")}'))
+            message.append(util.emph(  f'origin   x y z: {util.srepr( self.origin,"   ")}'))
 
         if other.N_materials != self.N_materials:
-            message.append(util.deemph(f'# materials:        {other.N_materials}'))
-            message.append(util.emph(  f'# materials:        { self.N_materials}'))
+            message.append(util.deemph(f'# materials:    {other.N_materials}'))
+            message.append(util.emph(  f'# materials:    { self.N_materials}'))
+
+        if np.nanmin(other.material) != np.nanmin(self.material):
+            message.append(util.deemph(f'min material:   {np.nanmin(other.material)}'))
+            message.append(util.emph(  f'min material:   {np.nanmin( self.material)}'))
 
         if np.nanmax(other.material) != np.nanmax(self.material):
-            message.append(util.deemph(f'max material:       {np.nanmax(other.material)}'))
-            message.append(util.emph(  f'max material:       {np.nanmax( self.material)}'))
+            message.append(util.deemph(f'max material:   {np.nanmax(other.material)}'))
+            message.append(util.emph(  f'max material:   {np.nanmax( self.material)}'))
 
-        return util.return_message(message)
+        print(util.srepr(message))
+
+        return True if message != [] or (other.material != self.material).any() else False
 
 
     @property
diff --git a/python/damask/_result.py b/python/damask/_result.py
index 07b66f139..7cfe66c0b 100644
--- a/python/damask/_result.py
+++ b/python/damask/_result.py
@@ -1234,7 +1234,7 @@ class Result:
         ----------
         output : str or list of str
             Labels of the datasets to read. Defaults to '*', in which
-            case all datasets are placed.
+            case all datasets are read.
         flatten : bool
             Remove singular levels of the folder hierarchy.
             This might be beneficial in case of single increment,
diff --git a/python/damask/util.py b/python/damask/util.py
index 904277852..3fe30320a 100644
--- a/python/damask/util.py
+++ b/python/damask/util.py
@@ -22,7 +22,6 @@ __all__=[
          'scale_to_coprime',
          'project_stereographic',
          'hybrid_IA',
-         'return_message',
          'execution_stamp',
          'shapeshifter', 'shapeblender',
          'extend_docstring', 'extended_docstring',
@@ -64,7 +63,8 @@ def srepr(arg,glue = '\n'):
            (hasattr(arg, '__getitem__') or
             hasattr(arg, '__iter__'))):
         return glue.join(str(x) for x in arg)
-    return arg if isinstance(arg,str) else repr(arg)
+    else:
+       return arg if isinstance(arg,str) else repr(arg)
 
 
 def emph(what):
@@ -463,26 +463,6 @@ def dict_flatten(d):
 ####################################################################################################
 # Classes
 ####################################################################################################
-class return_message:
-    """Object with formatted return message."""
-
-    def __init__(self,message):
-        """
-        Set return message.
-
-        Parameters
-        ----------
-        message : str or list of str
-            message for output to screen
-
-        """
-        self.message = message
-
-    def __repr__(self):
-        """Return message suitable for interactive shells."""
-        return srepr(self.message)
-
-
 class _ProgressBar:
     """
     Report progress of an interation as a status bar.
diff --git a/python/tests/test_Grid.py b/python/tests/test_Grid.py
index 24d48bd56..6ccd100fc 100644
--- a/python/tests/test_Grid.py
+++ b/python/tests/test_Grid.py
@@ -14,8 +14,7 @@ from damask import grid_filters
 def grid_equal(a,b):
     return np.all(a.material == b.material) and \
            np.all(a.cells    == b.cells) and \
-           np.allclose(a.size, b.size) and \
-           str(a.diff(b)) == str(b.diff(a))
+           np.allclose(a.size, b.size)
 
 @pytest.fixture
 def default():
@@ -43,12 +42,12 @@ class TestGrid:
         print('patched datetime.datetime.now')
 
     def test_diff_equal(self,default):
-        assert str(default.diff(default)) == ''
+        assert not default.diff(default)
 
 
     def test_diff_not_equal(self,default):
         new = Grid(default.material[1:,1:,1:]+1,default.size*.9,np.ones(3)-default.origin,comments=['modified'])
-        assert str(default.diff(new)) != ''
+        assert default.diff(new)
 
     def test_repr(self,default):
         print(default)