  Structured-light 3D scanners create 3D models with high accuracy, but
controlling the accuracy and repeatability of the scanner is essential. The
objective of this paper is to analyze the repeatability and accuracy of two
structured-light 3D scanners (Go!SCAN 20TM and Go!SCAN 50TM). The method used
scans steel gauge blocks several times with different resolutions to analyze
the scanned data and to test the correlation between uncertainty, resolution,
and scanner model. The primary results include: 1) a systematic error of
magnitude similar to nominal accuracy exists and must be corrected and 2) the
global uncertainty is approximately 0.05 mm without significant differences
between the two scanner models. A strategy for scanning is proposed based on
the results at different resolutions.
