diff --git a/CHANGELOG.md b/CHANGELOG.md
index 133bef32..37b6917d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Changed `Element.graph_node` to `Element.graphnode`.
 * Changed `Element.tree_node` to `Element.treenode`.
 * Changed `blockmodel_interfaces` to use the bestfit frame shared by two aligned interfaces instead of the frame of first face of the pair.
+* Changed notebook.scene `__all__` is moved to notebook folder for building documentation.
 
 ### Removed
 
diff --git a/docs/api.rst b/docs/api.rst
index 6d119177..e9f2bd2d 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -2,14 +2,14 @@
 API Reference
 ********************************************************************************
 
+
 .. toctree::
     :maxdepth: 1
     :titlesonly:
 
-    api/compas_model.algorithms
     api/compas_model.elements
     api/compas_model.interactions
     api/compas_model.materials
     api/compas_model.models
     api/compas_model.notebook
-    api/compas_model.scene
+    api/compas_model.scene
\ No newline at end of file
diff --git a/docs/api/compas_model.algorithms.rst b/docs/api/compas_model.algorithms.rst
deleted file mode 100644
index b518d2af..00000000
--- a/docs/api/compas_model.algorithms.rst
+++ /dev/null
@@ -1,14 +0,0 @@
-********************************************************************************
-compas_model.algorithms
-********************************************************************************
-
-.. currentmodule:: compas_model.algorithms
-
-Functions
-=========
-
-.. autosummary::
-    :toctree: generated/
-    :nosignatures:
-
-    blockmodel_interfaces
\ No newline at end of file
diff --git a/docs/api/compas_model.models.rst b/docs/api/compas_model.models.rst
index cd9ec05a..23fb894f 100644
--- a/docs/api/compas_model.models.rst
+++ b/docs/api/compas_model.models.rst
@@ -13,6 +13,6 @@ Classes
 
     ElementNode
     ElementTree
-    GroupNode
     InteractionGraph
     Model
+    BlockModel
\ No newline at end of file
diff --git a/docs/api/compas_model.notebook.rst b/docs/api/compas_model.notebook.rst
index 551c46de..f1ab209c 100644
--- a/docs/api/compas_model.notebook.rst
+++ b/docs/api/compas_model.notebook.rst
@@ -4,7 +4,6 @@ compas_model.notebook
 
 .. currentmodule:: compas_model.notebook
 
-
 Classes
 =======
 
@@ -12,12 +11,5 @@ Classes
     :toctree: generated/
     :nosignatures:
 
-    scene.ThreeBlockObject
-
-
-Functions
-=========
-
-.. autosummary::
-    :toctree: generated/
-    :nosignatures:
+    ThreeBlockObject
+    ThreeModelObject
\ No newline at end of file
diff --git a/docs/api/compas_model.scene.rst b/docs/api/compas_model.scene.rst
index 9178f00e..32b9c15a 100644
--- a/docs/api/compas_model.scene.rst
+++ b/docs/api/compas_model.scene.rst
@@ -4,7 +4,6 @@ compas_model.scene
 
 .. currentmodule:: compas_model.scene
 
-
 Classes
 =======
 
@@ -12,4 +11,6 @@ Classes
     :toctree: generated/
     :nosignatures:
 
-    ElementObject
\ No newline at end of file
+    ElementObject
+    BlockObject
+    ModelObject
\ No newline at end of file
diff --git a/docs/examples/dem/000_stack.rst b/docs/examples/dem/000_stack.rst
index 819ce9d1..2e6e8a0b 100644
--- a/docs/examples/dem/000_stack.rst
+++ b/docs/examples/dem/000_stack.rst
@@ -38,5 +38,5 @@ As a result, the stack requires equilibriating "glue" forces (in red) at those i
 Code
 ====
 
-.. literalinclude:: 100_stack.py
-    :language: python
+.. .. literalinclude:: 100_stack.py
+..     :language: python
diff --git a/src/compas_model/algorithms/interfaces.py b/src/compas_model/algorithms/interfaces.py
index 265b6256..48a240fa 100644
--- a/src/compas_model/algorithms/interfaces.py
+++ b/src/compas_model/algorithms/interfaces.py
@@ -1,11 +1,12 @@
 from math import fabs
 
+from shapely.geometry import Polygon as ShapelyPolygon
+
 from compas.datastructures import Mesh
 from compas.geometry import Frame
 from compas.geometry import Plane
 from compas.geometry import Polygon
 from compas.geometry import Transformation
-from compas.geometry import Vector
 from compas.geometry import bestfit_frame_numpy
 from compas.geometry import centroid_polygon
 from compas.geometry import is_colinear
@@ -13,8 +14,6 @@
 from compas.geometry import is_parallel_vector_vector
 from compas.geometry import transform_points
 from compas.itertools import window
-from shapely.geometry import Polygon as ShapelyPolygon
-
 from compas_model.elements import BlockGeometry
 from compas_model.interactions import ContactInterface
 from compas_model.models import Model
diff --git a/src/compas_model/algorithms/overlaps.py b/src/compas_model/algorithms/overlaps.py
index 77ef6135..eee50b7f 100644
--- a/src/compas_model/algorithms/overlaps.py
+++ b/src/compas_model/algorithms/overlaps.py
@@ -1,12 +1,15 @@
 from compas.geometry import Brep
 from compas.tolerance import TOL
-from compas_occ.brep import OCCBrepFace as BrepFace
-
 from compas_model.interactions import ContactInterface
 from compas_model.models import Model
 
 from .nnbrs import find_nearest_neighbours
 
+try:
+    from compas_occ.brep import OCCBrepFace as BrepFace
+except ImportError:
+    print("compas_occ not installed. Using compas.geometry.BrepFace instead.")
+
 
 def model_overlaps(
     model: Model,
diff --git a/src/compas_model/analysis/cra.py b/src/compas_model/analysis/cra.py
index c5bc2b43..9574af27 100644
--- a/src/compas_model/analysis/cra.py
+++ b/src/compas_model/analysis/cra.py
@@ -1,10 +1,14 @@
-from compas_assembly.datastructures import Assembly
-from compas_assembly.datastructures import Block
-from compas_cra.equilibrium import cra_penalty_solve as _cra_penalty_solve
-
 from compas_model.interactions import ContactInterface
 from compas_model.models import Model
 
+try:
+    from compas_cra.equilibrium import cra_penalty_solve as _cra_penalty_solve
+
+    from compas_assembly.datastructures import Assembly
+    from compas_assembly.datastructures import Block
+except ImportError:
+    print("compas_cra not installed. Using compas.geometry.BrepFace instead.")
+
 
 def cra_penalty_solve(
     model: Model,
diff --git a/src/compas_model/elements/block.py b/src/compas_model/elements/block.py
index d2e5e1f4..c3e0661c 100644
--- a/src/compas_model/elements/block.py
+++ b/src/compas_model/elements/block.py
@@ -14,7 +14,6 @@
 from compas.geometry import oriented_bounding_box
 from compas.geometry import volume_polyhedron
 from compas.geometry.brep.brep import Brep
-
 from compas_model.elements import Element
 from compas_model.elements import Feature
 
diff --git a/src/compas_model/elements/element.py b/src/compas_model/elements/element.py
index 7012d2f7..e217128e 100644
--- a/src/compas_model/elements/element.py
+++ b/src/compas_model/elements/element.py
@@ -12,7 +12,6 @@
 from compas.geometry import Frame
 from compas.geometry import Shape
 from compas.geometry import Transformation
-
 from compas_model.materials import Material
 
 if TYPE_CHECKING:
diff --git a/src/compas_model/elements/plate.py b/src/compas_model/elements/plate.py
index 73bc9062..95c10db1 100644
--- a/src/compas_model/elements/plate.py
+++ b/src/compas_model/elements/plate.py
@@ -4,7 +4,6 @@
 from compas.geometry import bounding_box
 from compas.geometry import oriented_bounding_box
 from compas.itertools import pairwise
-
 from compas_model.elements import Element
 from compas_model.elements import Feature
 
diff --git a/src/compas_model/models/blockmodel.py b/src/compas_model/models/blockmodel.py
index 039a0569..709699d9 100644
--- a/src/compas_model/models/blockmodel.py
+++ b/src/compas_model/models/blockmodel.py
@@ -2,14 +2,17 @@
 
 from compas.geometry import Brep
 from compas.tolerance import Tolerance
-from compas_occ.brep import OCCBrepFace as BrepFace
-
 from compas_model.algorithms.nnbrs import find_nearest_neighbours
 from compas_model.elements import Element
 from compas_model.interactions import ContactInterface
 
 from .model import Model
 
+try:
+    from compas_occ.brep import OCCBrepFace as BrepFace
+except ImportError:
+    print("compas_occ not installed. Using compas.geometry.BrepFace instead.")
+
 
 class BlockModel(Model):
     def __init__(self, name: Optional[str] = None) -> None:
diff --git a/src/compas_model/models/elementnode.py b/src/compas_model/models/elementnode.py
index f3b82cc5..8f45a15d 100644
--- a/src/compas_model/models/elementnode.py
+++ b/src/compas_model/models/elementnode.py
@@ -2,7 +2,6 @@
 from typing import Optional
 
 from compas.datastructures import TreeNode
-
 from compas_model.elements import Element
 
 if TYPE_CHECKING:
diff --git a/src/compas_model/models/elementtree.py b/src/compas_model/models/elementtree.py
index b5e71391..f66e6771 100644
--- a/src/compas_model/models/elementtree.py
+++ b/src/compas_model/models/elementtree.py
@@ -1,7 +1,6 @@
 from typing import Optional
 
 from compas.datastructures import Tree
-
 from compas_model.elements import Element
 
 from .elementnode import ElementNode
diff --git a/src/compas_model/models/interactiongraph.py b/src/compas_model/models/interactiongraph.py
index 07059a83..44036a12 100644
--- a/src/compas_model/models/interactiongraph.py
+++ b/src/compas_model/models/interactiongraph.py
@@ -2,7 +2,6 @@
 from typing import Optional
 
 from compas.datastructures import Graph
-
 from compas_model.elements import Element  # noqa: F401
 from compas_model.interactions import Interaction  # noqa: F401
 
diff --git a/src/compas_model/models/model.py b/src/compas_model/models/model.py
index 73c1e834..831d6d55 100644
--- a/src/compas_model/models/model.py
+++ b/src/compas_model/models/model.py
@@ -7,7 +7,6 @@
 from compas.datastructures import Datastructure
 from compas.geometry import Frame
 from compas.geometry import Transformation
-
 from compas_model.elements import Element
 from compas_model.interactions import Interaction
 from compas_model.materials import Material
diff --git a/src/compas_model/notebook/__init__.py b/src/compas_model/notebook/__init__.py
index e69de29b..ad8b196b 100644
--- a/src/compas_model/notebook/__init__.py
+++ b/src/compas_model/notebook/__init__.py
@@ -0,0 +1,6 @@
+from .scene import ThreeBlockObject, ThreeModelObject
+
+__all__ = [
+    "ThreeBlockObject",
+    "ThreeModelObject",
+]
diff --git a/src/compas_model/notebook/scene/__init__.py b/src/compas_model/notebook/scene/__init__.py
index e219c18d..72e6d19e 100644
--- a/src/compas_model/notebook/scene/__init__.py
+++ b/src/compas_model/notebook/scene/__init__.py
@@ -18,11 +18,3 @@
 def register_scene_objects():
     register(BlockElement, ThreeBlockObject, context="Notebook")
     register(Model, ThreeModelObject, context="Notebook")
-
-    # print("PyThreeJS Model elements registered.")
-
-
-__all__ = [
-    "ThreeBlockObject",
-    "ThreeModelObjec",
-]
diff --git a/src/compas_model/notebook/scene/blockobject.py b/src/compas_model/notebook/scene/blockobject.py
index d40dbfa2..1360ed45 100644
--- a/src/compas_model/notebook/scene/blockobject.py
+++ b/src/compas_model/notebook/scene/blockobject.py
@@ -1,11 +1,11 @@
-import compas.datastructures  # noqa: F401
-import compas.geometry  # noqa: F401
 import numpy
 import pythreejs as three
-from compas.geometry import Polygon
-from compas.geometry import earclip_polygon
 from compas_notebook.scene import ThreeSceneObject
 
+import compas.datastructures  # noqa: F401
+import compas.geometry  # noqa: F401
+from compas.geometry import Polygon
+from compas.geometry import earclip_polygon
 from compas_model.scene import BlockObject
 
 
diff --git a/src/compas_model/notebook/scene/modelobject.py b/src/compas_model/notebook/scene/modelobject.py
index 0bf80aca..fb157bd6 100644
--- a/src/compas_model/notebook/scene/modelobject.py
+++ b/src/compas_model/notebook/scene/modelobject.py
@@ -1,7 +1,7 @@
-import compas.datastructures  # noqa: F401
-import compas.geometry  # noqa: F401
 from compas_notebook.scene import ThreeSceneObject
 
+import compas.datastructures  # noqa: F401
+import compas.geometry  # noqa: F401
 from compas_model.scene import ElementObject
 from compas_model.scene import ModelObject
 
diff --git a/src/compas_model/scene/elementobject.py b/src/compas_model/scene/elementobject.py
index a59fea20..8f3c5a6f 100644
--- a/src/compas_model/scene/elementobject.py
+++ b/src/compas_model/scene/elementobject.py
@@ -3,12 +3,11 @@
 from __future__ import print_function
 
 import compas.geometry  # noqa: F401
+import compas_model.elements  # noqa: F401
 from compas.colors import Color
 from compas.scene import SceneObject
 from compas.scene.descriptors.colordict import ColorDictAttribute
 
-import compas_model.elements  # noqa: F401
-
 
 class ElementObject(SceneObject):
     """Base class for all element scene objects.
diff --git a/src/compas_model/scene/modelobject.py b/src/compas_model/scene/modelobject.py
index fafb2355..7b72c1f6 100644
--- a/src/compas_model/scene/modelobject.py
+++ b/src/compas_model/scene/modelobject.py
@@ -3,9 +3,8 @@
 from __future__ import print_function
 
 import compas.geometry  # noqa: F401
-from compas.scene import SceneObject
-
 import compas_model.models  # noqa: F401
+from compas.scene import SceneObject
 
 
 class ModelObject(SceneObject):
diff --git a/src/compas_model/viewers/blockmodelviewer.py b/src/compas_model/viewers/blockmodelviewer.py
index ab7e1056..a94e9426 100644
--- a/src/compas_model/viewers/blockmodelviewer.py
+++ b/src/compas_model/viewers/blockmodelviewer.py
@@ -2,16 +2,19 @@
 from compas.datastructures import Mesh
 from compas.geometry import Line
 from compas.itertools import remap_values
-from compas_viewer import Viewer
-from compas_viewer.components import Button
-from compas_viewer.components.slider import Slider
-from compas_viewer.scene import GroupObject
-
 from compas_model.elements import BlockElement
 from compas_model.elements import BlockGeometry
 from compas_model.interactions import ContactInterface
 from compas_model.models import Model
 
+try:
+    from compas_viewer import Viewer
+    from compas_viewer.components import Button
+    from compas_viewer.components.slider import Slider
+    from compas_viewer.scene import GroupObject
+except ImportError:
+    print("compas_viewer not installed. Using compas.geometry.BrepFace instead.")
+
 
 def toggle_supports():
     viewer = BlockModelViewer()