Vanya writes –
For most of the electronics projects I build for fun (power supplies, function generators, code keyers, 555 timer circuits, etc.), I usually just head to the local Radio Shack and buy one of their cheap plastic project cases. Unfortunately, these cases don’t have vents or fan ports, a desirable feature to have with circuits that dissipate a lot of heat, so I have to “drill my own”. I’ve since developed a quick and accurate technique to create these vents that others might find useful.
Make Your Own Vents In Electronic Project Cases – The Lyzrd’s Stomp – Link.