Getting Rough Surface when scanning smooth item

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I finished the scan with a grip positioned differently, a knife blade and a quarter all glued securely in place. Still seems pretty rough to me.

In the previous post I mentioned the probe tip does not return to the same spot when toggled around and released. When the scanner probe is going on a downhill slope of an object (knife Blade) the sound changes to sound a bit like the rattle of a loose piece of metal. Only when scanning in the downhill direction, not uphill.

This scan was done on best setting with the flex shaft detached.