Ok. Bit of a non control there. Overwriting the same file with exports... cursory hover of file showing 0 kb. Opening the file up in text editor shows...

Actual results. Exporting a single body part produces a 0 kb OBJ. Makes sense considering "unimesh".

Exporting full figure grouped, 1 level, working subdivided file.

No groups, same result.

Anyway. Good to know. Full figure subdivided works. Who knows how long I would of just assumed it was only in scene.