@2024-07-23 with BLENDER 4.2
in BLENDER
@Menu goto
Edit > Preferences
Make sure in 'system' have 'allow online access' checked.
Then go to 'get extensions' and looking for 'add-ons' , which in this case, is '3D Print Toolbox'.
On right hand side, will appear tab '3D Print' with 'Analyze', 'Clean Up', 'Edit', and 'Export'.
You can use 'Check All' to see any error for 3D printing, like 'non manifold edges' on 'non-flat faces'.