Print Fix
Which Blender versions and systems does it work on?
Blender 4.2 LTS and newer. Tested on Blender 4.2.9 LTS and 5.1.2 on Linux. It is plain Python on Blender's own libraries, so Windows and macOS should behave the same, but they have not been tested yet.
Does it change my original model?
No. Print Fix repairs a copy and hides the original. Discard Fixed Copy deletes the copy and shows the original again. A model that was already printable comes back unchanged.
Will it rebuild large missing areas nicely?
No. Holes are filled with flat triangles, so the result is watertight, not sculpted. For a large or strongly curved missing area, model the surface yourself; Select Problem Edges helps you find it.