The angle between the two hydrogen molecules is exactly 104.5º, resembling the real water molecule. However, the relative size of the hydrogen and oxygen molecules is kind of off.

I made this model in Onshape and somehow the model turned out to be tiny. Scale it up for [100,000] times.  

If the lock is too loose and cannot hold the molecules together, scale the z height to a smaller value. The tolerance works fine on my Ender-3, but might be a little problematic on newer and more advanced ones.