diff --git a/cg/freecad/utils/freecad_to_json.py b/cg/freecad/utils/freecad_to_json.py
index d1077c4..ec983e4 100644
--- a/cg/freecad/utils/freecad_to_json.py
+++ b/cg/freecad/utils/freecad_to_json.py
@@ -24,7 +24,9 @@ import Mesh
 import MeshPart
 import logging
 import math
-from freecad.utils.is_object_solid import is_object_solid
+
+from freecad.utils.solid_tools import (is_object_solid, collect_clones)
+
 from utils.custom_parser import CustomArgumentParser
 
 logger = logging.getLogger(__name__)
@@ -39,6 +41,9 @@ def freecad_to_json(**kwargs):
     doc = FreeCAD.open(kwargs['fcstd_path'])
     docname = doc.Name
 
+    # collect equal cad objects
+    clones = collect_clones(doc):
+
     # collect all materials
     fem_mats = []
     for fem_mat in doc.Objects:
diff --git a/cg/freecad/utils/is_object_solid.py b/cg/freecad/utils/is_object_solid.py
deleted file mode 100644
index 4104263..0000000
--- a/cg/freecad/utils/is_object_solid.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# coding: utf-8
-# Copyright (C) 2023 Ilia Kurochkin <brothermechanic@yandex.com>
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-'''
-DESCRIPTION.
-Simple FreeCAD's object test for manifold mawater-tight surface.
-'''
-__version__ = '0.2'
-import FreeCAD
-
-
-def is_object_solid(obj):
-    '''If obj is solid return True'''
-    if not isinstance(obj, FreeCAD.DocumentObject):
-        return False
-
-    if not hasattr(obj, 'Shape'):
-        return False
-
-    return obj.Shape.isClosed()
diff --git a/cg/freecad/utils/solid_tools.py b/cg/freecad/utils/solid_tools.py
new file mode 100644
index 0000000..74cc620
--- /dev/null
+++ b/cg/freecad/utils/solid_tools.py
@@ -0,0 +1,80 @@
+#  ***** BEGIN GPL LICENSE BLOCK *****
+#
+#   Copyright (C) 2021-2024 Robossembler LLC
+#
+#   Created by Ilia Kurochkin (brothermechanic)
+#   contact:    brothermechanic@yandex.com
+#
+#   This file is part of Robossembler Framework
+#   project repo:    https://gitlab.com/robossembler/framework
+#
+#   Robossembler Framework is free software;
+#   you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License
+#   as published by the Free Software Foundation; either version 3
+#   of the License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, see <https://www.gnu.org/licenses/>.
+#
+#  ***** END GPL LICENSE BLOCK *****
+#
+# coding: utf-8
+'''
+DESCRIPTION.
+Solid tools for FreeCAD's .FCStd scene.
+'''
+__version__ = '0.2'
+
+import logging
+import FreeCAD
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+
+def is_object_solid(obj) -> bool:
+    '''
+    Simple FreeCAD's object test for manifold mawater-tight surface.
+
+    :param obj: part, FreeCAD Part::Feature object
+    :returns: boolean of obj solid state
+    '''
+    if not isinstance(obj, FreeCAD.DocumentObject):
+        return False
+
+    if not hasattr(obj, 'Shape'):
+        return False
+
+    return obj.Shape.isClosed()
+
+
+def collect_clones(doc=FreeCAD.getDocument(FreeCAD.ActiveDocument.Label)) -> list:
+    '''
+    This script find equal cad parts in a FreeCAD .FCStd scene.
+
+    :param doc: document, freecad opened scene (or current scene)
+    :returns: list with clones sublists [['c0'], ['c1', 'c2', 'c4'],]
+    '''
+    doc_clones = []
+    for item in doc.Objects:
+        if not is_object_solid(item):
+            continue
+        item_clones = []
+        item_clones.append(item.Label)
+        for other in doc.Objects:
+            if other == item:
+                continue
+            if other.Shape.isPartner(item.Shape):
+                logger.info('%s and %s objects has equal Shapes',
+                            item.Label, other.Label)
+                item_clones.append(other.Label)
+        item_clones.sort()
+        if item_clones not in doc_clones:
+            doc_clones.append(item_clones)
+    return doc_clones