Water molecule demo model for your chemistry class (could be disassembled)

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.