Please keep in mind it helps others if you can locate and post the actual
part of a script you think has a problem instead of an entire scene file.
But also including a camera and light source. Don't worry about it, just
telling you what is easiest to get help with.

In this case the answer is surprisingly simple. Add the keyword 'sturm' to
your lathe in column_3, just before the 'rotate' line and after the last
vector. The reason is explained in the documentation, it has to do with
inaccuracies of the math involved.

Bob

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