I need to make a fan hole / mount in lexan for the window and the only real tool I have on hand is a dremel. I don't have a power drill, so buying a hole saw wouldn't work. Should I try to get a circle cutter at Home Depot, or would that not cut deep enough to make the hole? Is it unfeasible to use the dremel anyway because of molten plastic? Thanks for the help. This is for a 120mm fan, by the way.