Would it be possible to add this option to preform? I make model trains with my printer and update my design with minor tweaks after each print (let’s say I add 1x2mm part somewhere that I missed in the first version). I reexport STL from 3D software and then I have to regenerate all the support structure although virtually nothing has changed in the model that would require support changes. This gets very tedious since there is often a lot of (internal) supports that are carefully placed (sometime it takes me an hour to do) to avoid damaging the model later when I pull it out of supports. New preform does it better than 2.16 version but still it could be useful.
Something like : select existing model with supports - right click - update model - select new STL - preform updates model, checks for unsupported minima (if they now exist) and warns about it.