How can my print be so wrong ? PETG +-5mm diff

I have designed an enclosure for a PC case I am designing, but I am encountering such a big difference between the print and the 3d model.

Here the dimension is 130mm: as you can see:

And the real print comes up like this: (It is the same model, but as I already had this issue, I cut down the model to print it faster and be sure the mistake was not somewhere else)

Of course, I designed my piece so It tightly fits my components, so nothing works anymore,

Any ideas where this could come from?

are all dimensions not accurate or just one? my PETG prints warped / layers ripped apart with the open case. i now have an enclosed printer. otherwise you have to slow the print down like half speed to prevent warping. maybe try that?

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