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I am experiencing a lot of issues with the topology of a specific object I am modelling. Currently I have an issue with 'non-manifold vertices on it as shown by the screen shot below:

vertices

The mesh issue I have highlighted is found by operating Select>Select all by Trait>non-manifold and checking only the 'vertices' option in options menu as pictured in the bottom left of my screenshot.

I would specifically like to be able to identify what the tool Select all by Trait looks for when the 'vertices' option is selected, so I can better address my topology problem

I have read a fair bit about what can cause non-manifold geometry but simply non-manifold 'vertices' doesn't really mean a whole lot to me, can anyone shed any light

Here is the blend file:

N.B: I have recalculated internal and external normals as well as 'merged by distance' multiple times which doesn't seem to do anything

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For anyone else with this problem the detailing of this is actually outlined in the blender docs here

The docs say:

Vertices:

Selects vertices that belong to wire and multiple face edges, isolated vertices, and vertices that belong to non-adjoining faces.

In the attempt not to repeat the good descriptions that exist elsewhere on this stack:

Multiple_f_example

Vertices

N.B: if you hover over each option in the Select all by Trait menu you get a tooltip about each option:

tooltip

This is all my best answer as to each scenario, if edits are required please go ahead

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