extrude_until improvement - extrude examples

examples/key_cap.py

@@ -0,0 +1,69 @@
+"""
+
+name: key_cap.py
+by:   Gumyr
+date: September 20th 2022
+
+desc:
+
+    This example demonstrates the design of a Cherry MX key cap by using
+    extrude with a taper and extrude until next.
+
+    See: https://www.cherrymx.de/en/dev.html
+
+license:
+
+    Copyright 2022 Gumyr
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+"""
+from build123d import *
+
+with BuildPart() as key_cap:
+    # Start with the plan of the key cap and extrude it
+    with BuildSketch() as plan:
+        Rectangle(18 * MM, 18 * MM)
+    Extrude(amount=10 * MM, taper=15)
+    # Create a dished top
+    with Locations((0, -3 * MM, 47 * MM)):
+        Sphere(40 * MM, mode=Mode.SUBTRACT, rotation=(90, 0, 0))
+    # Fillet all the edges except the bottom
+    Fillet(
+        *key_cap.edges().filter_by_position(
+            Axis.Z, 0, 30 * MM, inclusive=(False, True)
+        ),
+        radius=1 * MM,
+    )
+    # Hollow out the key by subtracting a scaled version
+    Scale(by=(0.925, 0.925, 0.85), mode=Mode.SUBTRACT)
+
+    # Add supporting ribs while leaving room for switch activation
+    with Workplanes(Plane(origin=(0, 0, 4 * MM))):
+        with BuildSketch():
+            Rectangle(15 * MM, 0.5 * MM)
+            Rectangle(0.5 * MM, 15 * MM)
+            Circle(radius=5.5 * MM / 2)
+    # Extrude the mount and ribs to the key cap underside
+    Extrude(until=Until.NEXT)
+    # Find the face on the bottom of the ribs to build onto
+    rib_bottom = key_cap.faces().filter_by_position(Axis.Z, 4 * MM, 4 * MM)[0]
+    # Add the switch socket
+    with Workplanes(rib_bottom):
+        with BuildSketch() as cruciform:
+            Circle(radius=5.5 * MM / 2)
+            Rectangle(4.1 * MM, 1.17 * MM, mode=Mode.SUBTRACT)
+            Rectangle(1.17 * MM, 4.1 * MM, mode=Mode.SUBTRACT)
+    Extrude(amount=3.5 * MM, mode=Mode.ADD)
+
+if "show_object" in locals():
+    show_object(key_cap.part.wrapped, name="key cap", options={"alpha": 0.7})