diff --git a/notebook_nueva/left_side_lid.stl b/notebook_nueva/left_side_lid.stl
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diff --git a/notebook_nueva/lid.py b/notebook_nueva/lid.py
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+++ b/notebook_nueva/lid.py
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+import cadquery as cq
+from cadquery import exporters
+
+from modelo import mounting_pillar_positions, shell_t, width
+from utils import hex_vents, punch_hole
+
+# Dimensions for countersunk M4 screws
+m4_top = 7.5
+m4_bottom = 4
+m4_height = 2.5
+
+
+height = 64.5 + shell_t  # Measured
+thickness = shell_t
+front_lip = 8
+
+
+def model():
+    # Create the basic shape of the case bottom.
+    model = (
+        cq.Workplane("XY")
+        # Hollow box
+        .box(width, height, thickness)
+        .edges("|Z and >Y")
+        .fillet(2)
+    )
+
+    # Make many holes
+    vent = hex_vents(size=6, width=width * 0.9, height=height * 0.9)[0]
+    model = punch_hole(
+        model=model,
+        face=">Z",
+        w=width,
+        h=height,
+        x_offset=0.05 * width,
+        y_offset=0.05 * height,
+        hole=vent,
+        depth=thickness,
+    )
+
+    # Add screw holes
+    for position in mounting_pillar_positions:
+        model = (
+            model.faces(">Z")
+            .workplane(centerOption="CenterOfBoundBox")
+            .center(-width / 2 + position[0], height / 2 - position[1])
+            .placeSketch(cq.Sketch().circle(6))
+            .extrude(-thickness)
+            .faces(">Z")
+            .workplane(centerOption="CenterOfBoundBox")
+            .center(-width / 2 + position[0], height / 2 - position[1])
+            .cskHole(m4_bottom, m4_top, 82, depth=None)
+        )
+
+    # Add front edge
+
+    model = (
+        model.faces(">Z")
+        .workplane(centerOption="CenterOfBoundBox")
+        .center(0, -height / 2 - shell_t / 2)
+        .placeSketch(cq.Sketch().trapezoid(width, shell_t, 90))
+        .extrude(-front_lip - thickness)
+    )
+
+    return model
+
+
+if __name__ == "__main__":
+
+    model = model()
+    exporters.export(model, "lid.stl")
+
+    exporters.export(
+        model.faces(">X").workplane(offset=-width / 2).split(keepTop=True),
+        "right_side_lid.stl",
+    )
+    exporters.export(
+        model.faces(">X").workplane(offset=-width / 2).split(keepBottom=True),
+        "left_side_lid.stl",
+    )
diff --git a/notebook_nueva/lid.stl b/notebook_nueva/lid.stl
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diff --git a/notebook_nueva/right_side_lid.stl b/notebook_nueva/right_side_lid.stl
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