New Preform 1.8

This is not something you can find. That trim the base automatically when the support are generated.

The only downside is that automatically repositions the model to better fit in the build area. But it doesn’t take in account if you have multiple objects.
For exemple, bellow i could have been able to print both if preform had cut the top/bottom base and would not put them in the center when supports are generated

Ahh… OK, thanks @Gillesalexandre. I could see it trying with a large object…

This is a very good function also…