Solved
Hi Ramon,
This is because the line weights (and the styles) are rendered proportionally to each other in the 3D figure, whereas in the 2D figures the lines are rendered accurately using the measurement from the pens and line styles.
Because the 2D figures always have a page defined the lines can be rendered accurately in relation to the page size, this is not true for the 3D figures where this is not always a page and therefore a real world size to reference.
This article although for a different symptom explains the reason behind it.
https://www.ptc.com/en/support/article/cs382496?posno=1&q=line%20weight&source=search
Adrian
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