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.