diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04606419e5a8..6229fd504c1d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 * Updated workflows to v2.
+* Changed deepcopy of `RhinoBrep` to use the native `Rhino.Geometry` mechanism.
+* The normal of the cutting plane is no longer flipped in `compas_rhino.geometry.RhinoBrep`.
 
 ### Removed
 
diff --git a/src/compas_rhino/geometry/brep/brep.py b/src/compas_rhino/geometry/brep/brep.py
index 11a042e39bc7..f03676f07f87 100644
--- a/src/compas_rhino/geometry/brep/brep.py
+++ b/src/compas_rhino/geometry/brep/brep.py
@@ -65,6 +65,9 @@ def __init__(self, brep=None):
         super(RhinoBrep, self).__init__()
         self._brep = brep or Rhino.Geometry.Brep()
 
+    def __deepcopy__(self, *args, **kwargs):
+        return self.copy()
+
     # ==============================================================================
     # Data
     # ==============================================================================
@@ -88,6 +91,17 @@ def data(self, data):
             RhinoBrepFace.from_data(f_data, builder)
         self._brep = builder.result
 
+    def copy(self, cls=None):
+        """Creates a deep-copy of this Brep using the native Rhino.Geometry.Brep copying mechanism.
+
+        Returns
+        -------
+        :class:`~compas_rhino.geometry.RhinoBrep`
+
+        """
+        # Avoid reconstruction when just copying. for sake of efficiency and stability
+        return RhinoBrep.from_native(self._brep.DuplicateBrep())
+
     # ==============================================================================
     # Properties
     # ==============================================================================
@@ -219,7 +233,7 @@ def trim(self, trimming_plane, tolerance=TOLERANCE):
         Parameters
         ----------
         trimming_plane : :class:`~compas.geometry.Frame` or :class:`~compas.geometry.Plane`
-            The frame or plane to use when trimming.
+            The frame or plane to use when trimming. The discarded bit is in the direction of the frame's normal.
 
         tolerance : float
             The precision to use for the trimming operation.
@@ -232,7 +246,6 @@ def trim(self, trimming_plane, tolerance=TOLERANCE):
         if isinstance(trimming_plane, Plane):
             trimming_plane = Frame.from_plane(trimming_plane)
         rhino_frame = frame_to_rhino(trimming_plane)
-        rhino_frame.Flip()
         results = self._brep.Trim(rhino_frame, tolerance)
         if not results:
             raise BrepTrimmingError("Trim operation ended with no result")