There are literally more than 100 threads that deal with hollowing, and requests for this feature going back to basically the beginning (2013). back in 2017, Formlabs (Frew) made this statement
> FrewFormlabs
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> Sep '17
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> This is something we’re considering but we’re also wary of inflating the capabilities of PreForm and raising the learning curve for new users. In many cases, it makes sense to modularize tasks like this; containing mesh modifications in programs like Meshmixer and print setup in PreForm. Our strategy thus far has been to educate users on the various tools that can be used for mesh modification and make PreForm the best it can be for print setup. We have a tutorial on hollowing parts in Meshmixer if you’re interested.
That was then, when the playfield was still in Formlabs’ favor. Since then, other software became available which left Preform in the dust in terms of features and function. Those arguments Frew tossed in at the time no longer hold water.
But the reason why you don’t see a lot of 'traction" is because a lot of folks have gotten so used to Formlabs saying NO, that they don’t even bother.
That was the case a while back when folks were asking for a means to mirror an object in Preform. Same push back, same arguments. But eventually they relented and now there’s a mirror function. Who know a year or two from now, the hollowing out function might appear on Preform.
But by then, who know how many potential users FormLabs would have lost