By the way - always trust layer view - it's what you get. If it doesn't look right don't "hope for the best" and go ahead and print, lol. And always check layer view as it reminds you things you forgot such as "oh - crap - I forgot brim" or "oops - infill is wrong" or "oops - those overhangs will be tough".
Some of your walls are too thin to print. Cura doesn't like to print thinner than 2xnozzle width so about .8mm. Due to floating point errors it's safest to make all your walls at least 1mm wide.
If you want a quick and dirty solution you can lower your nozzle a bit *and* lower your shell size to be an integer ratio of that. .4mm is standard nozzle. So for example you could enter .35mm nozzle and .7mm shell and your part might come out in layer view. If so you can increase to .36 .37 .38 and so on until you have the thickest possible. The printer will print okay at .35mm (even though it's a .4mm nozzle). It will put the lines .35mm apart in the infill instead of .4mm and it will underextrude the proper amount. But the quality will suffer a little bit. Going down below .3mm will be pretty bad quality - still maybe good enough for you.
If you created the model it would be better to just make all the vertical walls at least 1mm.
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