Depends how thick you print it, of course. This vessel I printed has a wall varying from 2-4mm and has no visible flex to the tightest grip I dare do short of breaking it. Of course it's an inherently strong shape, ribbed, not for pleasure, but for internal strength.
The wall isn't solid, of course: the printing software automatically fills any thickness with honeycomb that's more air than plastic.
EDITED: 27 May 2020 10:04 by MANTHORP