I like the the tin can idea,if you could use plyers to roll the joining edge in on one it would probably be almost as good as the commercial ones. I actually built two wooden rectangular frames out of plywood scraps for mine. works well, Just lay it on a piece of cardboard on the ground, fill the bottom one, put whatever im casting and some baby powder in and fill it to the top. lift the top frame and run a knife between them and it separates clean at least 80% of the time. then slide the cardboard out from under just in case and pour. And definitely will keep playing, it's like an itch I gotta scratch. I'm sure you know the feeling haha.