Thank you for the answer but that is not good for me since I don't create the files in CAD myself (i'm a beginner).
The things I want to print are coming from the internet (thingiverse) and I can't change them myself.
Even so, thank you for the answer
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gr5 2,224
This is normal for all 3d printers. PLA is like snot when melted - it sticks to itself and is stretchy. As it comes out of the nozzle it cools slightly and shrinks and is like a liquid rubber band. When wrapping around that hole it is pulling inward and the final dimensions of vertical holes are typically 0.4 to 0.5mm smaller than in CAD. This is VERY Hard to fix in the slicer as the possible geometries are infinite. Not everyone prints flat plates with vertical holes. Note that horizontal holes don't have this problem.
Anyway the normal fix is to add around 0.4 to 0.5mm to the diameter of every vertical hole in CAD. This is not the only technology where you have to "fudge" things like this. It's much worse with injection molding - there you can't even let 90 degree corners be 90 degrees!
Unfortunately there is no magic fix with cura settings (e.g. negative horizontal expansion and scaling) unless your part is extremely simple.
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