Smoothing makes a mess of faces

[changrilla]

Many thanks, I understand why now. It has a high poly count as it was a trace of an image of a pencil sketch, it's hard to predict the end result with a low poly count. In this case it's for cnc machining. I was unaware of Flow Connect. Great piece of software, very fast once you get the hang of the slightly unusual LMR mouse button usage.