3D printed polymer parts (e.g. PA12, PA11 etc) have a high coefficient of thermal expansion (CTE) and
can be hygroscopic. In addition, they may change shape/size subtly over time due to internal stress
relaxation. The net result of this is that if a part is to be used to validate a measurement apparatus (3D
scanners etc) on real world parts with representative optical surfaces, as opposed to test artefacts which
are in the majority made of different (stable) materials, there is a challenge to ensure that ambient
conditions do not affect the outcome. We propose an approach that uses a stable ‘core’ of material that
is then covered with a thin layer of the material under test (‘veneer’).
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INC, HP, "STABLE GROUND TRUTH ARTEFACTS FOR MEASUREMENT VALIDATION FOR 3D SCANNERS", Technical Disclosure Commons, (September 23, 2021)