Diffusing Leds the Fast Way
For my Led Cube project I needed diffused (opaque) leds. And I didn't have any. On the instructables pages you can find instructions how to sand your leds by hand. There it is mentioned that it takes about 5 minutes per led. I don't have that kind of time (or patience) to spend 64x 5 minutes. So I went on a 'Home Improvement' mission to use some power tools to diffuse my leds more efficiently.
Warning: you should be prepared to lose some leds in this process, depending on the speed of your drill :)