I want to increase the hole size of my signal vias on my PCB from 8mil to 12mil since that will save me about $100 getting the boards manufactured.
I increased the hole size, but for now, I left the via diameter as-is (which is 16mil). The general practice that I follow is that the via diameter should be 2x larger than the hole size. Increasing the diameter to 24mil would be difficult, since it would require some extra time to move components around on the board.
So my question is: what are the risks of having a via diameter that is too close to the via hole size?