I've had a for a while now that the walls of my prints don't touch and that the top/bottom layers are full of gaps.
BUT
I have also noticed that when I print the calibration test that comes standard with the ultimaker, it prints perfectly.
The stuff I'm currently printing is pretty big so it moves around more.
Would this mean I would have to toy around with the belts?
Does it seem like the most logical problem here, becuase it does not seem like underextrusion (I get a nice little heap of material at the start of a print when it pre-extrudes before the priming and no layers that seem underextruded, just a gap between walls and top/bottom layers.)