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Is there a way to prevent the hot-end straying over non-printed areas?

Posted: Mon Jun 08, 2020 8:17 am
by cnd
I'm printing a tall thin part - a turbine blade. It is fat at the base, skinny at the tip, and twisted along the length.

The hot-end is, for no sensible reason I can imagine, moving over the non-printed area at times, and when it returns, it is knocking the top of the print.

Is there a way to force it never to go outside the print area, so that can never happen?
The part (it is two blades, joined at the trailing edge)
The part (it is two blades, joined at the trailing edge)