I've had the same problem. First time I saw it, I threw away my grinder (a cheap aluminum grinder). Having aluminum shavings in your lungs is no laughing matter. You can look up the material safety sheet, but it can lead to some bad problems over time. Its not worth debating if its for personal health. You gotta think long term here, people. We all know we're going to be smoking weed for years and years :rastasmoke: