You won't get away with using any Anvil Industry models with anything but the largest of 28mm modern miniatures. Even the old Assault Group figures are pushing how large the Games Workshop-esque Anvil Industry proportions. Which is obviously what they're designed to work with.
They're multipart, which is why I see them on occasion being used by modern 28mm gamers, but don't really have an analogue with the rest of the current popular 28mm modern range (i.e. Empress' stuff and others).
With 3D printing the closest I've seen is multi-part pewter figures. I.e. replacement arms and heads attached to a one piece torso/ body combination. I suspect that a multi-part kit costs a good amount to create and produce, compared to single pose sculpts (where if they want variance they just replace the head and sculpt on different gear). Which other than for the extra components in a kit, I wouldn't be too bothered about having plastic kits. I have hundreds of mono pose pewter figures and there's plenty of variety in there because of it.
Still, I could always use a kit for spare bits to make sci-fi figures.