Use when custom Build123d Python CAD code, geometry operations, selectors, locations, joints, assemblies, imports, exports, or DFM details are needed. Read `references/dfm-rules.md` BEFORE writing the first line of geometry code for any screw boss, standoff, snap fit, wall interface, or overhang-sensitive feature — not after the shape exists. A screw fastening into a 3D-printed part additionally requires the `build123d-libs` kit; never hand-model that joint.
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