Well done. I love making tools.  I too would like to see some actions shots of how it works. 

Like Ryan, I had to google oil filter cutter to find out why one would want to do that.  I found a video showing a guy just using tin snips and it took him about a minute to cut it open.  Thought it might be handy for us mere mortals that would rarely need to do such a thing.  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.