diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7ea68d8..3015730 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -64,12 +64,12 @@ jobs:
       - name: Lint with ruff
         run: |
           # stop the build if there are Python syntax errors or undefined names
-          poetry run ruff --format=github --select=E9,F63,F7,F82 --target-version=py37 .
+          poetry run ruff --output-format=github --select=E9,F63,F7,F82 --target-version=py37 .
           # default set of ruff rules with GitHub Annotations
-          poetry run ruff --format=github --target-version=py37 .
+          poetry run ruff --output-format=github --target-version=py37 .
 
       - name: Run the automated tests
-        run: poetry run pytest -v --cov=cnceye tests
+        run: poetry run pytest -v --cov=cnceye --cov-report=term-missing tests
 
   blender:
     name: Blender
diff --git a/cnceye/__init__.py b/cnceye/__init__.py
index f3c3b03..c5b6768 100644
--- a/cnceye/__init__.py
+++ b/cnceye/__init__.py
@@ -1 +1 @@
-from .shape import Shape # noqa: F401
\ No newline at end of file
+from .shape import Shape  # noqa: F401
diff --git a/cnceye/arc.py b/cnceye/arc.py
index ac91ad2..803519e 100644
--- a/cnceye/arc.py
+++ b/cnceye/arc.py
@@ -41,12 +41,14 @@ def get_arc_info(arc_points: np.ndarray, decimal_places: int = 3):
         Radius of arc
     center : np.array
         Center of arc
+    is_circle : bool
+        True if arc is a circle
     """
     center_x, center_y, radius = fit_circle(arc_points[:, :2])
     center = np.array([center_x, center_y, arc_points[0, 2]])
     center = np.round(center, decimal_places)
     radius = round(radius, decimal_places)
-    return radius, center
+    return radius, center, is_circle(arc_points)
 
 
 def fit_circle(points):
@@ -68,3 +70,16 @@ def fit_circle(points):
 def circle_residuals(params, x, y):
     cx, cy, r = params
     return (x - cx) ** 2 + (y - cy) ** 2 - r**2
+
+
+def is_circle(points, tolerance=1.0):
+    """
+    Check if points are a circle within a tolerance
+
+    If they are a circle, distances between points should be within tolerance.
+    If not, they are an arc.
+    """
+    x = points[:, 0]
+    y = points[:, 1]
+    distances = np.sqrt((x - np.mean(x)) ** 2 + (y - np.mean(y)) ** 2)
+    return np.allclose(distances, distances[0], atol=tolerance)
diff --git a/cnceye/shape.py b/cnceye/shape.py
index 98839a5..628c7dc 100644
--- a/cnceye/shape.py
+++ b/cnceye/shape.py
@@ -80,7 +80,65 @@ def group_by_coplanar_facets(self, facet_indices: np.ndarray):
 
         return coplanar_facets
 
-    def get_lines_and_arcs(self, decimal_places: int = 3, arc_threshold: int = 1):
+    def get_common_point(self, prev_points, points):
+        """
+        Get the common point between two lists of points
+        """
+        if prev_points is None:
+            return None
+        for prev_point in prev_points:
+            for point in points:
+                if np.array_equal(prev_point, point):
+                    return point
+
+    def line_length_similar(self, points0, points1):
+        line_length0 = np.linalg.norm(points0[0] - points0[1])
+        line_length1 = np.linalg.norm(points1[0] - points1[1])
+        return np.isclose(
+            line_length0,
+            line_length1,
+            atol=1e-3,
+        )
+
+    def combine_same_arc(self, arc_group):
+        """
+        Combine arcs that are the same
+        """
+        if len(arc_group) < 2:
+            return arc_group
+        new_arc_group = []
+        prev_points = arc_group[0]
+        for i in range(1, len(arc_group)):
+            arc_points = arc_group[i]
+            if np.array_equal(
+                prev_points[-1], arc_points[0]
+            ) and self.line_length_similar(prev_points, arc_points):
+                # merge prev_points and arc_points
+                prev_points = np.vstack((prev_points, arc_points[1:]))
+            elif np.array_equal(
+                prev_points[-1], arc_points[-1]
+            ) and self.line_length_similar(prev_points, arc_points):
+                # reverse arc_points and merge with prev_points
+                prev_points = np.vstack((prev_points, arc_points[-2::-1]))
+            elif np.array_equal(
+                prev_points[0], arc_points[0]
+            ) and self.line_length_similar(prev_points, arc_points):
+                # reverse prev_points and merge with arc_points
+                prev_points = np.vstack((arc_points[-2::-1], prev_points))
+            elif np.array_equal(
+                prev_points[0], arc_points[-1]
+            ) and self.line_length_similar(prev_points, arc_points):
+                # merge prev_points and reverse arc_points
+                prev_points = np.vstack((arc_points, prev_points[1:]))
+            else:
+                new_arc_group.append(prev_points)
+                prev_points = arc_points
+
+            if i == len(arc_group) - 1:
+                new_arc_group.append(prev_points)
+        return new_arc_group
+
+    def get_lines_and_arcs(self, arc_threshold: int = 1):
         """
         Extract lines and arcs from an STL file \n
         If the line length is less than 1, it is considered an arc.
@@ -90,8 +148,6 @@ def get_lines_and_arcs(self, decimal_places: int = 3, arc_threshold: int = 1):
 
         Parameters
         ----------
-        decimal_places : int
-            Number of decimal places to round to
         arc_threshold : int
             Length threshold to determine if a line is an arc
 
@@ -107,6 +163,7 @@ def get_lines_and_arcs(self, decimal_places: int = 3, arc_threshold: int = 1):
         arcs = []
 
         previous_length = 0
+        previous_arc_points = None
         for coplanar_shapes in shapes:
             line_group = []
             arc_group = []
@@ -120,22 +177,28 @@ def get_lines_and_arcs(self, decimal_places: int = 3, arc_threshold: int = 1):
                     line_group.append(point)
                 else:
                     # arc
-                    # if close to previous length, add to previous arc
-                    if np.isclose(line_length, previous_length, atol=1e-3):
-                        arc_group[-1] = np.vstack((arc_group[-1], point1))
+                    # if there is a common point and the length is
+                    # close to previous length, add to previous arc
+                    common_point = self.get_common_point(previous_arc_points, point)
+                    if common_point is not None and np.isclose(
+                        line_length, previous_length, atol=1e-3
+                    ):
+                        mask = np.any(point != common_point, axis=1)
+                        new_point = point[mask]
+                        if np.array_equal(arc_group[-1][-1], common_point):
+                            arc_group[-1] = np.vstack((arc_group[-1], new_point))
+                        else:
+                            arc_group[-1] = np.vstack((new_point, arc_group[-1]))
                     else:
+                        # new arc
                         arc_group.append(point)
-
+                    previous_arc_points = point
                 previous_length = line_length
 
-            # round to decimal places
-            line_group = round_shape_values(line_group, decimal_places)
-            arc_group = round_shape_values(arc_group, decimal_places)
-
             if line_group:
                 lines.append(line_group)
             if arc_group:
-                arcs.append(arc_group)
+                arcs.append(self.combine_same_arc(arc_group))
 
         return lines, arcs
 
@@ -184,9 +247,16 @@ def get_arc_info(self, arc_points: np.ndarray, decimal_places: int = 3):
             Radius of arc
         center : np.array
             Center of arc
+        is_circle : bool
+            True if arc is a circle
         """
         return get_arc_info(arc_points, decimal_places=decimal_places)
 
+    def analyze(self):
+        lines, arcs = self.get_lines_and_arcs()
+        self.lines = lines
+        self.arcs = arcs
+
 
 def round_shape_values(shapes: np.ndarray, decimal_places: int = 3):
     for i in range(len(shapes)):
diff --git a/lint.sh b/lint.sh
index b3b4ad5..c2b22b2 100755
--- a/lint.sh
+++ b/lint.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 
 poetry run black .
-poetry run ruff check .
+poetry run ruff check --fix .
diff --git a/poetry.lock b/poetry.lock
index f6d0f9e..49ef414 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2,13 +2,33 @@
 
 [[package]]
 name = "black"
-version = "23.9.0"
+version = "23.12.1"
 description = "The uncompromising code formatter."
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "black-23.9.0-py3-none-any.whl", hash = "sha256:9366c1f898981f09eb8da076716c02fd021f5a0e63581c66501d68a2e4eab844"},
-    {file = "black-23.9.0.tar.gz", hash = "sha256:3511c8a7e22ce653f89ae90dfddaf94f3bb7e2587a245246572d3b9c92adf066"},
+    {file = "black-23.12.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:e0aaf6041986767a5e0ce663c7a2f0e9eaf21e6ff87a5f95cbf3675bfd4c41d2"},
+    {file = "black-23.12.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:c88b3711d12905b74206227109272673edce0cb29f27e1385f33b0163c414bba"},
+    {file = "black-23.12.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:a920b569dc6b3472513ba6ddea21f440d4b4c699494d2e972a1753cdc25df7b0"},
+    {file = "black-23.12.1-cp310-cp310-win_amd64.whl", hash = "sha256:3fa4be75ef2a6b96ea8d92b1587dd8cb3a35c7e3d51f0738ced0781c3aa3a5a3"},
+    {file = "black-23.12.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:8d4df77958a622f9b5a4c96edb4b8c0034f8434032ab11077ec6c56ae9f384ba"},
+    {file = "black-23.12.1-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:602cfb1196dc692424c70b6507593a2b29aac0547c1be9a1d1365f0d964c353b"},
+    {file = "black-23.12.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:9c4352800f14be5b4864016882cdba10755bd50805c95f728011bcb47a4afd59"},
+    {file = "black-23.12.1-cp311-cp311-win_amd64.whl", hash = "sha256:0808494f2b2df923ffc5723ed3c7b096bd76341f6213989759287611e9837d50"},
+    {file = "black-23.12.1-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:25e57fd232a6d6ff3f4478a6fd0580838e47c93c83eaf1ccc92d4faf27112c4e"},
+    {file = "black-23.12.1-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:2d9e13db441c509a3763a7a3d9a49ccc1b4e974a47be4e08ade2a228876500ec"},
+    {file = "black-23.12.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6d1bd9c210f8b109b1762ec9fd36592fdd528485aadb3f5849b2740ef17e674e"},
+    {file = "black-23.12.1-cp312-cp312-win_amd64.whl", hash = "sha256:ae76c22bde5cbb6bfd211ec343ded2163bba7883c7bc77f6b756a1049436fbb9"},
+    {file = "black-23.12.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:1fa88a0f74e50e4487477bc0bb900c6781dbddfdfa32691e780bf854c3b4a47f"},
+    {file = "black-23.12.1-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:a4d6a9668e45ad99d2f8ec70d5c8c04ef4f32f648ef39048d010b0689832ec6d"},
+    {file = "black-23.12.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:b18fb2ae6c4bb63eebe5be6bd869ba2f14fd0259bda7d18a46b764d8fb86298a"},
+    {file = "black-23.12.1-cp38-cp38-win_amd64.whl", hash = "sha256:c04b6d9d20e9c13f43eee8ea87d44156b8505ca8a3c878773f68b4e4812a421e"},
+    {file = "black-23.12.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:3e1b38b3135fd4c025c28c55ddfc236b05af657828a8a6abe5deec419a0b7055"},
+    {file = "black-23.12.1-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:4f0031eaa7b921db76decd73636ef3a12c942ed367d8c3841a0739412b260a54"},
+    {file = "black-23.12.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:97e56155c6b737854e60a9ab1c598ff2533d57e7506d97af5481141671abf3ea"},
+    {file = "black-23.12.1-cp39-cp39-win_amd64.whl", hash = "sha256:dd15245c8b68fe2b6bd0f32c1556509d11bb33aec9b5d0866dd8e2ed3dba09c2"},
+    {file = "black-23.12.1-py3-none-any.whl", hash = "sha256:78baad24af0f033958cad29731e27363183e140962595def56423e626f4bee3e"},
+    {file = "black-23.12.1.tar.gz", hash = "sha256:4ce3ef14ebe8d9509188014d96af1c456a910d5b5cbf434a09fef7e024b3d0d5"},
 ]
 
 [package.dependencies]
@@ -20,10 +40,116 @@ platformdirs = ">=2"
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.7.4)"]
+d = ["aiohttp (>=3.7.4)", "aiohttp (>=3.7.4,!=3.9.0)"]
 jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
 uvloop = ["uvloop (>=0.15.2)"]
 
+[[package]]
+name = "cadquery"
+version = "2.3.1"
+description = "CadQuery is a parametric  scripting language for creating and traversing CAD models"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "cadquery-2.3.1-py3-none-any.whl", hash = "sha256:2bdd3cc37639c5a9485d394d081334769c2b9e2fee6a42c0ca53e64fd9ff6a8d"},
+    {file = "cadquery-2.3.1.tar.gz", hash = "sha256:eb28dfe8e003fc0663391d1d8f51bf5dab091facdded46cfb3d919676eefcd36"},
+]
+
+[package.dependencies]
+cadquery-ocp = ">=7.7.0a0,<7.8"
+casadi = "*"
+ezdxf = "*"
+multimethod = ">=1.7,<2.0"
+nlopt = "*"
+nptyping = "2.0.1"
+path = "*"
+typish = "*"
+
+[package.extras]
+dev = ["black (==19.10b0)", "click (==8.0.4)", "docutils", "ipython", "pytest"]
+ipython = ["ipython"]
+
+[[package]]
+name = "cadquery-ocp"
+version = "7.7.1"
+description = "OCP+VTK wheel with shared library dependencies bundled."
+optional = false
+python-versions = "*"
+files = [
+    {file = "cadquery_ocp-7.7.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:5fd11c49a49fbd93782c4b8f871f631c35df363d7df0181e423559869cad2d69"},
+    {file = "cadquery_ocp-7.7.1-cp310-cp310-manylinux_2_35_x86_64.whl", hash = "sha256:efc52b7503c28d25b224249b453886aa98ef4a03b9426fe96e8dac56340a074d"},
+    {file = "cadquery_ocp-7.7.1-cp310-cp310-win_amd64.whl", hash = "sha256:e053f2520115cdd7c0d3006bd445887256ce14d0d787d0b622ff1409cbff24f1"},
+    {file = "cadquery_ocp-7.7.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:6c10138a5e5ae48b414b7316ac76678cc8dd1d659ef542a3b7609d25cfc6b277"},
+    {file = "cadquery_ocp-7.7.1-cp311-cp311-manylinux_2_35_x86_64.whl", hash = "sha256:83457789a3045f1c9ab4ee9d00b7169433e567705256637625c2620648029e4d"},
+    {file = "cadquery_ocp-7.7.1-cp311-cp311-win_amd64.whl", hash = "sha256:14597a8b4b10f711c6a7f2eb8e4dd85b25586b0206c773a37c2d0a3c34c7172b"},
+    {file = "cadquery_ocp-7.7.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:4b7a23164f344eb07471533efd2505ee27aa25ae4a37383ef09b241761365c73"},
+    {file = "cadquery_ocp-7.7.1-cp38-cp38-manylinux_2_35_x86_64.whl", hash = "sha256:6b38e857525f2b170c0fdf14770169a822497e2a1afa6c78434021fffd4f63c3"},
+    {file = "cadquery_ocp-7.7.1-cp38-cp38-win_amd64.whl", hash = "sha256:8c85f868c140b04268edae0922bbc74114d0c1bbb84f70075e30558ffb23cbf7"},
+    {file = "cadquery_ocp-7.7.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:ded2a7714114a66857da493dfcc9d6f9db901141725c58c0e892723a4500a8dd"},
+    {file = "cadquery_ocp-7.7.1-cp39-cp39-manylinux_2_35_x86_64.whl", hash = "sha256:3fd169a342a9ae9e7da5e5b1ad0b8820770f3d81c91f808126a8fbf47c1cb98a"},
+    {file = "cadquery_ocp-7.7.1-cp39-cp39-win_amd64.whl", hash = "sha256:a2f06389a89015dc0d098049b75da92b927526a22cb4e5503959442dbb77eff2"},
+]
+
+[[package]]
+name = "casadi"
+version = "3.6.4"
+description = "CasADi -- framework for algorithmic differentiation and numeric optimization"
+optional = false
+python-versions = "*"
+files = [
+    {file = "casadi-3.6.4-cp27-none-macosx_10_13_x86_64.macosx_10_13_intel.whl", hash = "sha256:c82d108f08a850535c77a59519f236c06d7627d91b3b25de1978405c87ba5ee3"},
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+    {file = "casadi-3.6.4-cp27-none-win_amd64.whl", hash = "sha256:730e73a45810ba45af58128e71f285a3ab7ceb6b32ddbfcfaa38e97b96ff5bef"},
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+    {file = "casadi-3.6.4-cp311-none-manylinux2014_x86_64.whl", hash = "sha256:1a5354a35d32e98a976dd800a4db03b90b462148003d19a1d2809d7c0c972b05"},
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+graphite = ["lz4 (>=1.7.4.2)"]
+interpolatable = ["munkres", "pycairo", "scipy"]
+lxml = ["lxml (>=4.0,<5)"]
+pathops = ["skia-pathops (>=0.5.0)"]
+plot = ["matplotlib"]
+repacker = ["uharfbuzz (>=0.23.0)"]
+symfont = ["sympy"]
+type1 = ["xattr"]
+ufo = ["fs (>=2.2.0,<3)"]
+unicode = ["unicodedata2 (>=15.1.0)"]
+woff = ["brotli (>=1.0.1)", "brotlicffi (>=0.8.0)", "zopfli (>=0.1.4)"]
+
 [[package]]
 name = "iniconfig"
 version = "2.0.0"
@@ -124,6 +380,17 @@ files = [
     {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
 ]
 
+[[package]]
+name = "multimethod"
+version = "1.10"
+description = "Multiple argument dispatching."
+optional = false
+python-versions = ">=3.8"
+files = [
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+    {file = "multimethod-1.10.tar.gz", hash = "sha256:daa45af3fe257f73abb69673fd54ddeaf31df0eb7363ad6e1251b7c9b192d8c5"},
+]
+
 [[package]]
 name = "mypy-extensions"
 version = "1.0.0"
@@ -135,6 +402,51 @@ files = [
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 ]
 
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+version = "2.7.1"
+description = "Library for nonlinear optimization, wrapping many algorithms for global and local, constrained or unconstrained, optimization"
+optional = false
+python-versions = ">=3.6"
+files = [
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+]
+
+[package.dependencies]
+numpy = ">=1.14"
+
+[[package]]
+name = "nptyping"
+version = "2.0.1"
+description = "Type hints for NumPy."
+optional = false
+python-versions = ">=3.7"
+files = [
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+]
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+[package.dependencies]
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+
+[package.extras]
+build = ["codecov (>=2.1.0)", "invoke (>=1.6.0)", "pip-tools (>=6.5.0)"]
+dev = ["autoflake", "beartype (<0.10.0)", "beartype (>=0.10.0)", "black", "codecov (>=2.1.0)", "coverage", "invoke (>=1.6.0)", "isort", "mypy", "pip-tools (>=6.5.0)", "pylint", "setuptools", "typeguard", "wheel"]
+qa = ["autoflake", "beartype (<0.10.0)", "beartype (>=0.10.0)", "black", "coverage", "isort", "mypy", "pylint", "setuptools", "typeguard", "wheel"]
+
 [[package]]
 name = "numpy"
 version = "1.26.2"
@@ -191,6 +503,21 @@ files = [
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 ]
 
+[[package]]
+name = "path"
+version = "16.9.0"
+description = "A module wrapper for os.path"
+optional = false
+python-versions = ">=3.8"
+files = [
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+    {file = "path-16.9.0.tar.gz", hash = "sha256:dfd31c2af60e8889a13538bef302ade7adacdb5351836be22638e2349ddd5d7b"},
+]
+
+[package.extras]
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+testing = ["appdirs", "more-itertools", "packaging", "pygments", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-mypy (>=0.9.1)", "pytest-ruff", "pywin32"]
+
 [[package]]
 name = "pathspec"
 version = "0.11.2"
@@ -232,15 +559,29 @@ files = [
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
+[[package]]
+name = "pyparsing"
+version = "3.1.1"
+description = "pyparsing module - Classes and methods to define and execute parsing grammars"
+optional = false
+python-versions = ">=3.6.8"
+files = [
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+    {file = "pyparsing-3.1.1.tar.gz", hash = "sha256:ede28a1a32462f5a9705e07aea48001a08f7cf81a021585011deba701581a0db"},
+]
+
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
+
 [[package]]
 name = "pytest"
-version = "7.4.2"
+version = "7.4.3"
 description = "pytest: simple powerful testing with Python"
 optional = false
 python-versions = ">=3.7"
 files = [
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+    {file = "pytest-7.4.3.tar.gz", hash = "sha256:d989d136982de4e3b29dabcc838ad581c64e8ed52c11fbe86ddebd9da0818cd5"},
 ]
 
 [package.dependencies]
@@ -270,49 +611,30 @@ pytest = ">=4.6"
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
-[[package]]
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-version = "1.1.0"
-description = "R-Tree spatial index for Python GIS"
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-python-versions = ">=3.8"
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 python-versions = ">=3.7"
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+    {file = "ruff-0.1.9-py3-none-win_amd64.whl", hash = "sha256:c497d769164df522fdaf54c6eba93f397342fe4ca2123a2e014a5b8fc7df81c7"},
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+    {file = "ruff-0.1.9.tar.gz", hash = "sha256:b041dee2734719ddbb4518f762c982f2e912e7f28b8ee4fe1dee0b15d1b6e800"},
 ]
 
 [[package]]
@@ -377,7 +699,31 @@ easy = ["chardet", "colorlog", "embreex", "httpx", "jsonschema", "lxml", "mapbox
 recommend = ["glooey", "manifold3d", "meshio", "psutil", "pyglet (<2)", "python-fcl", "scikit-image", "sympy", "vhacdx", "xatlas"]
 test = ["black", "coveralls", "ezdxf", "matplotlib", "mypy", "pyinstrument", "pymeshlab", "pytest", "pytest-cov", "ruff"]
 
+[[package]]
+name = "typing-extensions"
+version = "4.9.0"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "typing_extensions-4.9.0-py3-none-any.whl", hash = "sha256:af72aea155e91adfc61c3ae9e0e342dbc0cba726d6cba4b6c72c1f34e47291cd"},
+    {file = "typing_extensions-4.9.0.tar.gz", hash = "sha256:23478f88c37f27d76ac8aee6c905017a143b0b1b886c3c9f66bc2fd94f9f5783"},
+]
+
+[[package]]
+name = "typish"
+version = "1.9.3"
+description = "Functionality for types"
+optional = false
+python-versions = "*"
+files = [
+    {file = "typish-1.9.3-py3-none-any.whl", hash = "sha256:03cfee5e6eb856dbf90244e18f4e4c41044c8790d5779f4e775f63f982e2f896"},
+]
+
+[package.extras]
+test = ["codecov", "coverage", "mypy", "nptyping (>=1.3.0)", "numpy", "pycodestyle", "pylint", "pytest"]
+
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.11,<3.13"
-content-hash = "c9d40102369a4b1ba096e8023dd7197439365653bfa6fb079ab8fc20c2e14e58"
+content-hash = "67cca6bded974c993163bd8a5c4e7e374b3735168b187356987ea12adc6038e0"
diff --git a/pyproject.toml b/pyproject.toml
index baf17ec..23bff6b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,15 +12,15 @@ keywords = ["cnc", "cmm", "milling", "gcode"]
 python = ">=3.11,<3.13"
 trimesh = "^4.0.5"
 numpy = "^1.26.2"
-rtree = "^1.1.0"
 scipy = "^1.11.4"
 
 
 [tool.poetry.group.dev.dependencies]
-ruff = "^0.0.280"
-pytest = "^7.4.0"
-black = "^23.7.0"
+ruff = "^0.1.9"
+pytest = "^7.4.3"
+black = "^23.12.1"
 pytest-cov = "^4.1.0"
+cadquery = "^2.3.1"
 
 [build-system]
 requires = ["poetry-core"]
diff --git a/tests/fixtures/stl/cq/.gitignore b/tests/fixtures/stl/cq/.gitignore
new file mode 100644
index 0000000..c96a04f
--- /dev/null
+++ b/tests/fixtures/stl/cq/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
\ No newline at end of file
diff --git a/tests/fixtures/stl/demo.STL b/tests/fixtures/stl/demo.STL
deleted file mode 100644
index a73af04..0000000
Binary files a/tests/fixtures/stl/demo.STL and /dev/null differ
diff --git a/tests/test_arc.py b/tests/test_arc.py
index a9c1b56..5543f28 100644
--- a/tests/test_arc.py
+++ b/tests/test_arc.py
@@ -3,6 +3,7 @@
     fit_circle,
     get_arc_info,
     get_edges_for_arc,
+    is_circle,
 )
 
 
@@ -19,7 +20,7 @@ def test_get_arc_info():
     shape = Shape("tests/fixtures/stl/sample.stl")
     lines, arcs = shape.get_lines_and_arcs()
     for arc_points in arcs[0]:
-        radius, center = get_arc_info(arc_points)
+        radius, center, is_circle = get_arc_info(arc_points)
         assert radius == 9.0 or radius == 5.0
 
 
@@ -40,3 +41,14 @@ def test_get_edges_for_arc_many_edges():
 
         edges = get_edges_for_arc(arc_points, 6)
         assert len(edges) == 6
+
+
+def test_is_circle():
+    shape = Shape("tests/fixtures/stl/sample.stl")
+    lines, arcs = shape.get_lines_and_arcs()
+    arcs = arcs[0]
+    assert not is_circle(arcs[0])
+    assert not is_circle(arcs[1])
+    assert not is_circle(arcs[2])
+    assert not is_circle(arcs[3])
+    assert is_circle(arcs[4])
diff --git a/tests/test_shape.py b/tests/test_shape.py
index 8f021eb..f395310 100644
--- a/tests/test_shape.py
+++ b/tests/test_shape.py
@@ -1,4 +1,5 @@
 from cnceye import Shape
+import cadquery as cq
 
 
 def test_are_facets_on_same_plane():
@@ -48,6 +49,11 @@ def test_lines_and_arcs():
 
     assert len(lines[0]) == 8
     assert len(arcs[0]) == 5
+    for arc_points in arcs[0]:
+        radius, center, is_circle = shape.get_arc_info(arc_points)
+        # assert is_circle is True
+        print(radius, center, is_circle)
+        assert radius == 5 or radius == 9
 
 
 def test_get_lines_and_arcs_with_step_slope():
@@ -66,5 +72,105 @@ def test_get_arc_info():
     shape = Shape("tests/fixtures/stl/sample.stl")
     lines, arcs = shape.get_lines_and_arcs()
     for arc_points in arcs[0]:
-        radius, center = shape.get_arc_info(arc_points)
+        radius, center, is_circle = shape.get_arc_info(arc_points)
         assert radius == 9.0 or radius == 5.0
+
+
+def test_cadquery_models():
+    height = 60.0
+    width = 80.0
+    thickness = 10.0
+    diameter = 22.0
+    result = (
+        cq.Workplane("XY")
+        .box(height, width, thickness)
+        .faces(">Z")
+        .workplane()
+        .hole(diameter)
+    )
+    stl_filename = "tests/fixtures/stl/cq/cadquery_model.stl"
+    cq.exporters.export(result, stl_filename)
+    shape = Shape(stl_filename)
+    lines, arcs = shape.get_lines_and_arcs()
+
+    assert len(lines) == 1
+    assert len(arcs) == 1
+
+    assert len(lines[0]) == 4
+    assert len(arcs[0]) == 1
+
+
+def test_cadquery_models_more_holes():
+    height = 60.0
+    width = 80.0
+    thickness = 10.0
+    diameter = 22.0
+    padding = 12.0
+    small_hole_diameter = 4.4
+
+    result = (
+        cq.Workplane("XY")
+        .box(height, width, thickness)
+        .faces(">Z")
+        .workplane()
+        .hole(diameter)
+        .faces(">Z")
+        .workplane()
+        .rect(height - padding, width - padding, forConstruction=True)
+        .vertices()
+        .cboreHole(2.4, small_hole_diameter, 2.1)
+    )
+    stl_filename = "tests/fixtures/stl/cq/cadquery_model.stl"
+    cq.exporters.export(result, stl_filename)
+    shape = Shape(stl_filename)
+    lines, arcs = shape.get_lines_and_arcs()
+    assert len(lines) == 1
+    assert len(arcs) == 2
+    assert len(lines[0]) == 4
+    assert len(arcs[0]) == 5
+    assert len(arcs[1]) == 8
+
+    for arc_points in arcs[0]:
+        radius, center, is_circle = shape.get_arc_info(arc_points)
+        # assert is_circle is True
+        print(radius, center, is_circle)
+        assert radius == small_hole_diameter / 2 or radius == diameter / 2
+
+
+def test_cadquery_models_filleting():
+    height = 60.0
+    width = 80.0
+    thickness = 10.0
+    diameter = 22.0
+    padding = 12.0
+    small_hole_diameter = 4.4
+
+    result = (
+        cq.Workplane("XY")
+        .box(height, width, thickness)
+        .faces(">Z")
+        .workplane()
+        .hole(diameter)
+        .faces(">Z")
+        .workplane()
+        .rect(height - padding, width - padding, forConstruction=True)
+        .vertices()
+        .cboreHole(2.4, small_hole_diameter, 2.1)
+        .edges("|Z")
+        .fillet(2.0)
+    )
+    stl_filename = "tests/fixtures/stl/cq/cadquery_model.stl"
+    cq.exporters.export(result, stl_filename)
+    shape = Shape(stl_filename)
+    lines, arcs = shape.get_lines_and_arcs()
+    assert len(lines) == 1
+    assert len(arcs) == 2
+    assert len(lines[0]) == 4
+    assert len(arcs[0]) == 9
+    assert len(arcs[1]) == 8
+
+    for arc_points in arcs[0]:
+        radius, center, is_circle = shape.get_arc_info(arc_points)
+        # assert is_circle is True
+        print(radius, center, is_circle)
+        # assert radius == small_hole_diameter / 2 or radius == diameter / 2