That looks like underextrusion to me. Massive underextrusion - like you are only getting half as much filament out through the nozzle as desired.
Is it possible you accidentally tried to print this with a 0.4mm nozzle? As that would explain everything.
Your settings look fine. You dont' show how many walls in settings but I can see 3 walls in the print so with a shell width of 2.1 and 3 passes that averages 0.7mm per pass which is < 0.8mm which is fine and 0.2mm layer height is fine with a 0.8 nozzle and your speed of 50mm/sec is quite doable (50mm/sec * 0.2mm height * 0.7mm width is 7 cubic mm per second which is very easy even with a non-plus ultimaker 2. With the plus it's very easy with a 0.8mm nozzle (hard with a 0.4 though!).
Well something is seriously wrong. I still like my 0.4mm nozzle theory. Or maybe you are printing non-pla filament but at pla temperatures.
The strange thing is that the top layer infill looks fine - only the shells look bad. Are they supported underneath? They should be identical on every layer.
I guess I'd like to see more settings - I want to see inner/outer and infill line widths. I want to see qty of walls (it sure looks like 3).
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Tim Warren 0
Forgot my Cura settings. Here's a screen shot.
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