Hello my ultimaker is working fine but i have a few problems with the software. .

[MecuTheCreator 0]

The quality i select doesnt apply to the 3d printer when it does print.(why is that?)

and also sometimes when the object is nearly finished (50%) the 3d printer stops printing and prints in the sky.

Why is that ?

[gr5 2,210]

When you say "the quality", are you talking about the layer height?  You can override the layer height so you should always check that and if you don't want to override it, make sure that you did not override it.

 

For the one that was "printing in the sky", please post a picture of what things looked like when you first noticed it printing in the sky but before you cleaned up the build plate.  I can think of about 5 different possibilites of what you are talking about but one is easy to check now - look in the PREVIEW pane of cura and see if it is skipping layers.

 

More likely though your part got loose and wasn't sticking to the glass well.  If this is the case my first question is: what material were you printing?