Look at the part in cura "layer view". Is it filling in the holes on purpose? If so uncheck "fix horrible type a' in cura.
Please show a photo of your result. For example:
the 0.5mm diameter hole gets filled in completely.
May mean different things to you and me. For me completely means you can't even tell where it was supposed to be because the slicer put diagonal lines over it. Alternatively if it is just a bit small then make the hole larger in CAD by say .3 to .5mm to compensate for your result.
I recommend tilting the object so that the icon is at the front instead of the top. This will most likely print better. As the details on the XZ and YZ plane are better then the XY plane.
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