I use soup, coffee, juice, etc cans to store stuff in like the rest of you guys. But the one use that is very useful, is to use them as molten aluminum molds. If you have leftover aluminum after pour. It makes real good turning material, because it's already round. One idea I haven't tried yet, but will soon is to prop a piece shafting vertically inside the can then pour around it. That way you have the shafting cast to aluminum disk. This could be used to build a belt grinder drive shaft and wheel. The coffee cans will make 6" diameter wheels. Depending on how deep you pour the aluminum as to how wide the wheels will be. Just and idea.
Larry