solidcraft-robust-build-order

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# SolidCraft: robust general modeling workflow

General lessons validated on tapered and pocketed arm parts from timed speed-modeling tests and on a tutorial hook. Apply them to any part, timed or not.

## 1. Build order (fewest failures)
1. Base body from one profile sketch, extruded symmetric (operation new).
2. Second profile (other plane) extruded with operation `intersect` on the base body. Do the intersect BEFORE other cuts. Never intersect after a bore is cut: it once returned a silently wrong solid (centre of mass shifted, volume +60%) with no error.
3. Bores and holes as `solid.cylinder` cuts with explicit base, axis and targets (then a circular or linear pattern of the cylinder cut if repeated), or a simple sketch-circle extrude cut.
4. Pockets and cavities: sketch a polygon, extrude it as a separate "Cutter" body, trim it with `solid.box` or cylinders (targets `[Cutter]`). A cut through the middle splits it into `Cutter` and `Cutter (1)`. Finish with `solid.combine` cut using ALL tool bodies.
5. Fillets and chamfers: on a simple prismatic body do them right after the base and holes (section 3a). On a complex body (sphere, loft, sweep, draft, cavity) do them last, or before the complex feature is added (section 3b).

Keep the model as few features and as few bodies as you can. Fillets work best on one simple body, and the kernel has less to compute.

## 2. Boolean rules