diff --git a/city_model_structure/attributes/polyhedron.py b/city_model_structure/attributes/polyhedron.py
index b792eee5..9a9a3306 100644
--- a/city_model_structure/attributes/polyhedron.py
+++ b/city_model_structure/attributes/polyhedron.py
@@ -30,7 +30,8 @@ class Polyhedron:
     self._min_z = None
     self._min_y = None
     self._min_x = None
-    self._geometry = GeometryHelper(delta=0.5, area_delta=0.001)
+    self._geometry = GeometryHelper(delta=5.0, area_delta=0.01)
+    print(f'[{self._geometry._area_delta} {self._geometry._delta}]')
 
   def _position_of(self, point, face):
     vertices = self.vertices
@@ -53,7 +54,7 @@ class Polyhedron:
         found = False
         for vertex_2 in self._vertices:
           found = False
-          if self._geometry.almost_equal(vertex_1, vertex_2, True):
+          if self._geometry.almost_equal(vertex_1, vertex_2):
             found = True
             break
         if not found:
@@ -139,8 +140,6 @@ class Polyhedron:
       else:
         point_index = point_index + 3
         if point_index >= len(points_list):
-          # print('wroooong', complementary_surface.type)
-          # print(complementary_surface.points)
           return triangles
       if len(points_list) == 9:
         # the rest point's are already a triangle
diff --git a/tests/test_geometry_factory.py b/tests/test_geometry_factory.py
index 4d36871f..80e46ec2 100644
--- a/tests/test_geometry_factory.py
+++ b/tests/test_geometry_factory.py
@@ -79,11 +79,16 @@ class TestGeometryFactory(TestCase):
     city = City.load(self._kelowna_pickle_file)
     helper = GeometryHelper(delta=0.0, area_delta=0.5)
     errors = 0
+    ok = 0
     for building in city.buildings:
       building._polyhedron._geometry = helper
       if str(building.volume) == 'inf':
-        building.obj_export(self._output_path)
+        building.stl_export(self._output_path)
         errors += 1
+      elif ok == 0:
+        building.stl_export(self._output_path)
+        print(f'ok {building.name} {building.volume}')
+        ok = 1
     print(f'{errors} buildings aren\'t closed volumes')
 
   def test_citygml_buildings(self):