When your PCB is almost ready for order, just generate production files, you notice that BGA underfill tooling clearance was 1 mm too narrow.... only 40 parts needs to be moved. Whole sunday spent, only one cluster to go
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Usually underfill is injected from one side. So you don't need the 1mm all around. Talk to your fab, most likely the empty space visible on the top right was sufficient
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(and one edge has components that i don't want to move)