Got my dremel a few days ago, and this is the first hole I've cut. It's a 120mm side intake hole. Gonna put an Evercool aluminum fan in there, 84 CFM, 31dBa. As you can see, I slipped and went a bit too far with the dremel in two or three places, but overall, I think it turned out okay. With the fan grill on, no one will be able to tell I slipped. The pics are right after I cut it. I've since used some rubbing compound to take out the smaller scratches, so it looks a lot cleaner. All that remains are the big scratches.