SOlid inspector is finding problems that I cant see

NCO

Hello everyone. Again Im having an issue with solid inspector in that its finding a problem but when I try to fix it its coming up with faces that dont seen to have edges. I havent seen anything like this before and have no idea what to do....

Im sure this is an obvious beginner mistake but its just beyond me . Any help is really appreciated.

Unknown layers.skp

Box

Turn on Hidden Geometry from the View menu and you will see these two little lines that solid inspector is highlighting in red.
Delete them and you have a solid.

NCO

Thanks so much Box! I would never have found that. Just so I dont do it again in the future are there common ways this hidden geometry is made?

Box

I remember being plagued by stray loose hidden bits of geometry when I was learning. I never worked out what specifically was creating them. Sometimes it's as if moving something stretched the line and a hidden bit springs magically into existence, or you delete a face but somehow some parts didn't get deleted. Someone else may be able to explain exactly why.
Personally i have found they happen rarely once you become more proficient. You model more cleanly and things just don't seem to mess up like they did.

Best thing is you now know how to find them, or at least know that if solid inspector is telling you something is there it really is. There are various tool to help clean up models.
Thomthom's Cleanup, for example, will delete hidden stray geometry among other things.

Another thing that caught my eye, I think this cut out will cause you some problems if you are going for 3d printing. You might want to remodel it to make it something definite, at the moment it's sort of just a gap and you can see the edges bleeding through. Plus the face at the back is reversed.

NCO

Thanks for the advice. I will see if making the gap wider will help. Im guessing that the area is so thin that its causing this as an issue.

TIG

The tools to help you resolve issues with non-solids...

Solid Inspector will show issues but not fix them...

Then in combination with an 'edit'...

Layers - all switched ON [in case you have nested objects on OFF layers, or even worse! geometry on a layer that is not Layer0 that is off !!]
View > Hidden Geometry > ON [shows invisible edges and 'hidden' objects]
View in Xray mode [allows selection and deletion of internal edges]
Section Planes [to allow you to access the inside of objects to remove faces, edges etc]
Select + <delete> [to delete unwanted faces/edges]
Erase [to remove unwanted edges by picking]
Move [to select and relocate vertices to heal small holes etc]
Line Tool [to over-drawn edges and [re]create missing faces]

Remember that a solid group or component can only contain geometry.
Every edge must have exactly two faces.
So that means...
No faceless edges.
No edges around a hole [no matter how tiny].
No edges forming the unbounded side of a flap or shelf.
No internal partition faces, which would then have some edges used by three or more faces.
No otherwise seemingly solid boxes touching on a shared edge - which then has four faces.
No exactly overlaid coplanar faces with shared edges - can happen [rarely] with some plugin operations.