I wanted to know if there’s an easy way to do it. There probably is, but interestingly enough, it doesn’t come up as easily when searching for it.
Maybe the 3D Print Toolbox Addon?
1 Like
If you are looking for loose faces, then, when in face mode, choose Select->Select All By Trait->Loose Faces
If you are after edges / vertices around holes, in the respective edge / vertex mode, choose Select->Select All By Trait->Non Mainfold.
3 Likes
Thank you. This is exactly what I wanted to know. I appreciate it.
No worries. 
Is there a way of binding this to a shortcut? I’m finally making the move to Blender 2.8 and found that selecting non manifold meshes’ is not as easy as it was in 2.79, the version I started using Blender with. It’s really convenient during retopology and modelling, and in 2.79 the key bind for it was “shift+ctrl+m”.
I tried that shortcut in 2.8 and nothing happened, and it seems like it was removed.
Yep, just highlioght the command in the menu, right click your mouse and choose add shortcut. Just remember to save your preferences if it isn’t set for auto-save, otherwie your shortcut will be reset when you exit Blender.
1 Like
I am not understanding why “make manifold” does not show up and is it in a addon ? Or is there something being inferred that i am missing ?
There is no “make mainfold” as that is an arbitary thing, how exactly should the program make the mesh manifold?
There is actually an add-on which do the job pretty well, it’s 3D-Print Toolbox. It’s in Blender 2.8 but i can’t find out where they put the “manifold” button. I was used to it’s previous location on Blender 2.79!
After you’ve added the 3D-Print Toolbox add-on, there will be a new 3D-Print tab between the View and Edit tabs. Expand this and expand Clean-up section - and there’s the “Make Manifold” button.