diff --git a/Makefile b/Makefile
index ab5d384..c3291df 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,6 @@ blend:
 	$(BLENDER) blender/case_back.blend --background --python scripts/export_blender.py
 	$(BLENDER) blender/trigger_R2.blend --background --python scripts/export_blender.py
 	$(BLENDER) blender/trigger_R4.blend --background --python scripts/export_blender.py
-	$(BLENDER) blender/anchor.blend --background --python scripts/export_blender.py
 	$(BLENDER) blender/dhat.blend --background --python scripts/export_blender.py
 	$(BLENDER) blender/thumbstick.blend --background --python scripts/export_blender.py
 	$(BLENDER) blender/button_home.blend --background --python scripts/export_blender.py
diff --git a/build123d/anchor.py b/build123d/anchor.py
new file mode 100644
index 0000000..66fcb56
--- /dev/null
+++ b/build123d/anchor.py
@@ -0,0 +1,107 @@
+from build123d import (
+    BuildPart, BuildSketch, BuildLine, Box, Plane, Polyline, Rectangle, Location, Locations,
+    Axis, Rot, Mode, Align, Until, Cylinder, RegularPolygon,
+    mirror, make_face, edges, extrude, fillet, chamfer, split, faces, add, loft)
+
+
+# top
+TOP_WIDTH = 8
+TOP_DEPTH = 8
+TOP_HEIGHT = 8.3
+TOP_PTS = ((0,4),
+    (11, 4),
+    (TOP_DEPTH, TOP_HEIGHT),
+    (0, TOP_HEIGHT),
+    (0, 4))
+CHAMFER = 1
+
+NUT_THICKNESS = 2.3 # should be 1.75 according to https://www.engineersedge.com/hardware/standard_metric_hex_nuts_13728.htm
+NUT_WIDTH = 5 # across flats for M2.5 x 0.45
+NUT_TOLERANCE = +0.181
+
+BOLT_HOLE_RADIUS = 1.3
+
+# bottom
+BOTTOM_WIDTH = 7
+BOTTOM_HEIGHT = 4
+BOTTOM_PTS = ((6, 0),
+    (15, 0),
+    (11, BOTTOM_HEIGHT),
+    (6, BOTTOM_HEIGHT),
+    (6, 0))
+
+BOTTOM_CUTOUT_WIDTH = 3
+BOTTOM_CUTOUT_PTS = ((6, 0),
+    (10, 0),
+    (6, 4),
+    (6, 0))
+
+FDM_BRIDGE_THICKNESS = 0.2 # only for FDM printing, otherwise set to 0.0
+
+
+with BuildPart() as anchor:
+    #Top
+    with BuildSketch(Plane.YZ):
+        with BuildLine():
+            Polyline(TOP_PTS)
+        make_face()
+    extrude(amount=TOP_WIDTH)
+
+    edge_list = edges().filter_by(Axis.Z)
+    chamfer(edge_list, CHAMFER)
+
+    # Remove cutout for nut
+    location = Location((TOP_WIDTH / 2, # align center
+        TOP_DEPTH / 2, # align center
+        TOP_HEIGHT - NUT_THICKNESS))
+    with BuildSketch(location):
+        RegularPolygon((NUT_WIDTH + NUT_TOLERANCE) / 2, 6, major_radius=False)
+    extrude(amount=NUT_THICKNESS, mode=Mode.SUBTRACT)
+
+    # Remove cutout for bolt
+    location = Location((TOP_WIDTH / 2, # align center
+        TOP_DEPTH / 2,  # align center
+        (TOP_HEIGHT + BOTTOM_HEIGHT) / 2))
+    with Locations(location):
+        Cylinder(BOLT_HOLE_RADIUS, TOP_HEIGHT - BOTTOM_HEIGHT, mode=Mode.SUBTRACT)
+
+    # Additional cutout to generate bridge for FDP printing
+    if FDM_BRIDGE_THICKNESS > 0:
+        location = Location((TOP_WIDTH / 2, # align center
+            TOP_DEPTH / 2, # align center
+            (TOP_HEIGHT + BOTTOM_HEIGHT) / 2 - FDM_BRIDGE_THICKNESS))
+        with Locations(location):
+            Box(BOLT_HOLE_RADIUS * 2,
+                NUT_WIDTH + NUT_TOLERANCE,
+                FDM_BRIDGE_THICKNESS,
+                mode=Mode.SUBTRACT)
+
+
+    # Bottom
+    plane = Plane.YZ.offset((TOP_WIDTH - BOTTOM_WIDTH) / 2)
+    with BuildSketch(plane):
+        with BuildLine():
+            Polyline(BOTTOM_PTS)
+        make_face()
+    extrude(amount=BOTTOM_WIDTH)
+
+    with BuildPart(mode=Mode.SUBTRACT):
+        plane = Plane.YZ.offset(TOP_WIDTH - BOTTOM_WIDTH + BOTTOM_CUTOUT_WIDTH / 2)
+        with BuildSketch(plane):
+            with BuildLine():
+                Polyline(BOTTOM_CUTOUT_PTS)
+            make_face()
+        extrude(amount=BOTTOM_CUTOUT_WIDTH)
+
+
+
+
+# __main__ => show in VSCode
+# temp     => show in CQEditor
+if __name__ in ['__main__', 'temp']:
+    if __name__ == '__main__':
+        from ocp_vscode import show_object
+
+    show_object(anchor)
+
+    print(f"Volume: {anchor.part.volume}")
diff --git a/build123d/wheel.py b/build123d/wheel.py
index 7d39d17..9ffda69 100644
--- a/build123d/wheel.py
+++ b/build123d/wheel.py
@@ -14,7 +14,7 @@
 
 # Core
 CORE_RADIUS = 8
-CORE_TOLERANCE = 0.1
+CORE_TOLERANCE = 0.12
 RIGHT_PADDING_LEN = 1.8
 RIGHT_PADDING_RADIUS = 2
 HEX_DIAMETER = 2.05  # 2 millimeter + extra for better fit.
diff --git a/scripts/export_b123d.py b/scripts/export_b123d.py
index f4606c1..fcacaeb 100644
--- a/scripts/export_b123d.py
+++ b/scripts/export_b123d.py
@@ -8,6 +8,7 @@
 from button_select import button_select
 from button_dpad import button_dpad
 from cover import cover
+from anchor import anchor
 from button_abxy import button_abxy
 
 STL_DIR = 'stl/'
@@ -33,3 +34,6 @@ def export(obj, filename):
 
 # Battery Cover.
 export(cover.part, 'secondary_015mm_cover')
+
+# Anchor.
+export(anchor.part, 'any_015mm_anchors_2x')
diff --git a/scripts/export_blender.py b/scripts/export_blender.py
index 441b8b8..0f8ec73 100644
--- a/scripts/export_blender.py
+++ b/scripts/export_blender.py
@@ -132,7 +132,6 @@ def export(self):
     Entry('Home',             'secondary_007mm_home', rotate=True),
     Entry('Thumbstick',       'secondary_007mm_thumbstick', tolerance=True),
     Entry('Hexagon',          'conductive_015mm_hexagon', '-Z', tolerance=True),
-    Entry('Anchor',           'any_015mm_anchors_2x', '-Z', split=True),
     Entry('Soldering helper', 'any_020mm_solderstand', '-Z', merge=True),
 ]