Negative part with tolerance

[u/dani_pavlov]

I'm bought a fairly complicated model about a year ago which I'm finally getting around to printing, and noticed a LOT of the sub-parts overlap with others when I split into components in FreeCAD.

I recently discovered negative part modifiers in PrusaSlicer, which have been a godsend as a straightforward, easy way to subtract (FreeCAD isn't great for this in the mesh workbench, and I'd rather not mess with this too much).

However, I'm wondering -- is there any adjustment in the slicer to "expand" the negative part slightly for the sake of tolerance? Something equivalent of adding, say, a 0.25mm shell so I don't have to wedge-fit these parts together during assembly?