hey guys, We have a design project where we are supposed to design something cool to machine and later auction it off. My group has already come up with a plan to build a small stirling engine (if you have any other ideas of a cool object to make, let me know). I've been thinking if there could be anything we can add on to it, like a useful/fun addon... anything we can have it power? Thanks And any extra tips or ideas are highly valued! don't hesitate to speak your mind.