Whoops, I miscalculated yesterday. The figure is actually 135mm from heel to crown. And the saber definitely is shorter than inside elbow to knuckles.
So that actually works. I know this is shorter than in the show, and is shorter if I go by the same calculation of the concept art. That is by all the means possible- comparing the length of forearm or hip to knee or straight up measurement from crown to heel.
So I think if I go for 12″ or 30cm (probably 30cm as I can more easily work out wall thickness based on current 3D printer specs) I’ll have something that is as close to perfect as possible.