Ever hear of a sanding drum? takes the edges down quick. Then you only file to get it straight.XCVG said:I used my Dremel. Didn't get a very accurate hole and had to file a bunch. Didn't bother and it looked like crap. Not the Dremel's fault, I just suck. Leave the line, but don't leave too much or you'll spend a lot of time with a file.
Round perfboard from ratshack is great for fan holes, and speakers alike.XCVG said:Perfboard and a drill bit.