Yup. I've seen a planned computer assistance step get abandoned because we never figured out a way to work around thermal expansion issues. The objective was

Yup. I've seen a planned computer assistance step get abandoned because we never figured out a way to work around thermal expansion issues. The objective was to laser-paint a drawing of what they were to build, but we couldn't keep the laser from drifting. (That was ~20 years ago--now I would solve it by putting a camera with the laser, noting the discrepancy and adjusting the laser.)