Measure pinch span between thumb and index, palm breadth at the metacarpals, and the angle your wrist naturally prefers when flicking. A phone-based 3D scan helps, but paper calipers and photos work too. Translate those numbers into handle diameter, saddle curvature, and chamfer depth. You will feel immediate gains in comfort, faster transitions, and reduced micro-fatigue during quick rallies.
Set user parameters for handle width, flare length, and blade offset inside your CAD. Constrain sketches, loft between ergonomic profiles, and use variable fillets where fingers press hardest. With a single update, size up for adults or down for kids. Keep versions as you iterate, export comparison slices, and annotate why each change improved control, comfort, or confidence at impact.