You're a star, thank you, couldn't work out whether it was inner wall, outer wall, infill...... it was something else! Gapfill!
Turning gapfill off will solve the problem I am sure. Playing with line widths is also a good suggestion, however whatever worked for the middle of the part was ruining the top and bottom layer.
Is there any way to change the line width for gapfill? Or does it not work like that?
Thanks again, Matt.
That's the so-called "gap-fill".
You can set it to "nowhere" to disable it completely - i think this is the recommended setting for those face shields.
As an alternative you can possibly "play around" with the line width to get rid of it.
Or use the Cura build from @burtoogle, this will do what you suggest here (AFAIK):
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