You will always have a difference between the dimensions, but maybe not so much as you have.
First of all, you should be careful where you measure, because the corners could be bulged out and also the bottom of your object (aka elephant foot). So just measure from the top and not the whole side as on your pictures.
You should check if your axles have some play if you try to move them. Hold your printer frame with one hand and try with the other hand to move each axle. They should not move and you should not hear a click sound. You should check all four thicker axles, not the 2 through the print head.
Checking belts and lubrication, but I think you have already checked it.
I just printed a new cube with cura with this settings:
print speed : 30
default all other settings.
Filament is Ultimaker pla.
Picture axis order is: x,y,z
The printer is new and I need to understand if this is normal or my UM3 have some problems.
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