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Auxetic Grip Pad — Rotating-Squares Metamaterial (parametric, 4 sizes + coupon)

A flat, supportless auxetic grip pad — a sheet of rigid square tiles joined to their neighbours by thin living-hinge necks in a checkerboard, so it has a negative Poisson ratio (nu ~= -1): pull it and it expands on BOTH axes instead of necking in. That makes it go synclastic — drape it over a jar lid or dome and it caps the curve and hugs it instead of wrinkling, so it grips. Bundled at 4 grid sizes (3x3, 6x5, 8x8, 10x10), plus a 3x3 test coupon and the full parametric OpenSCAD source — change the grid, tile pitch, hinge width and thickness and re-render any size you like. Print in PETG or TPU: the necks are living hinges and PLA fatigue-cracks.