Yeah. I was reckoning kits, or pre-printed kits. Accessible kits. I mean, theoretically, you can do anything with a 3D printer, but as we have learned in the realms of prop building and miniatures gaming, "That doesn't mean you should do it."
As for myself? Something Allied: an accessible Cromwell or M3; something French. Gods help us something terribly uncommon like a *gasp* T-34/76. Axis: Something that isn't German. Something Hungarian, Italian, Japanese would be nice. Modern? T-55 seems like an obvious and very odd thing to have excluded, given it's the most world's most produced tank. Beyond that? Armored cars and halftracks actually configured for combat use. WW1 stuff in general.
As to what is currently available, I'm honestly still disappointed that the Sheridan was abandoned by Tamiya. Would be a hell of a lot of fun to have one of those and not have to worry so much about replacing split tracks.