Solid conumdrum
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Love Solid Inspector. Can't live (in SU) without it.
But this piece is driving me nuts (short put actually
)The model has dozens of solids, some far more complex than this one, and I had no trouble. But this one, was a solid during its early construction. I test components with SI often as I create them; saves much sleuthing later on.
However, SU does not indicate it is a solid, but SI reports no errors.

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Not real sure what I did other than exploding it and making it a component again but it shows a solid now.
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There is a nested group of lines inside inside the questionable group...see below
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As d12dozr explained you have a nested part within it, deleting it fixes it so it's solid.
Nested parts are acceptable if they are solid- but this nested part is not solid in itself.
A solid can only contain edges that have 'two faces'.
Any edge with more or fewer faces will make the form non-solid.
So faceless edge, faces with one edge [flaps] or internal partitions [giving you edges with three, four or more faces] will all return a non-solid.
You should also note that if you have two volumes [e.g. cubes] that are themselves 'solid' and they are moved to have a common edge they will no longer be solid as that common-edge then has more than two faces... To avoid that either move the forms so that they remain separated and have a tiny gap between them and the two edges don't merge into one etc, or slide them so they do overlap and a small internal face is created, but that you can then erase without affecting the rest, returning the now combined forms to have a 'solid' status... -
Thanks all for the help.
I deleted the phantom group and all is well. No idea why it was there in the first place.
Tig, thanks for explaining why some of my solids had problems. I previously stumbled upon the fact that I can have multiple separated solids within a group/comp and now I use that "feature" in places.
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