I'm not seeing any problem in the slicer - I think you are just seeing a moire pattern due to the resolution - if you zoom into those "holes" I think they will disappear.
The part itself seems to be suffering from some underextrusion. Usually fixed by printing slower (try half speed) or hotter (maybe 240C?). What were your settings for layer height, shell thickness, speed and temp (those are the 4 numbers that work together to tell you if you are printing too fast or too cold)?
Also what is your shell thickness? If you have a .4mm nozzle and ask for .8mm, Cura will do the equivalent of 200% flow and try to get .8mm of filament out of a .4mm nozzle. This works pretty well for things you want to be water tight but you have to print extra hot or slow as the pressures in the nozzle are much higher than normal.
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ultiarjan 1,223
can you change the settings on the pictures (public?) I can't open large versions.
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