New answers tagged pixelation
You'll have to manually tweak this into pixel perfection. With the 'Direct Selection Tool' (A), select each and every anchor point along the paths of the shape, and make sure it is aligned on a grid coordinate. Also, make sure you have View > 'Snap to Pixel' enabled.
Assuming these are all vector paths, the pixelation you are seeing is merely due to your screen. Screens are much lower resolution than your printer will be so you won't see this pixelation on press.
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