Hi,
I don’t quite understand this behavior: trimming is successful with a curve but fails with a line?
trim_with_region.gh (8.5 KB)
Hey, don’t really know why it’s happening, but insert XY plane works just fine 
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I actually think that, when you draw a planar cure (like you did), the component takes the plane where the curve stands.
But a line can be defined in an infinite amount of planes, so you have to manually input which one !
But that what I can come up with to explain this behaviour…
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ok I think I can answer this myself: intersection of 2d objects need a reference plane where the intersection is happening. in case of this curve its defined by the curve itself - and in case of a line there are infinite planes where the line could be part of.
It would be nice it gh would act in some cases more “strict” – it’s nice when it can figure out the orientation by itself but kinda hard to debug when the behaviour is not consistent.
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oh, am i too late? 
Haha close, very close ! 