Stack...thats just what I call it. I guess in retrospect rack would work just as well. But it just seems more apt. I dont know if anyone else thought of this. Most likely. Its a simple enough idea. I remember documenting it here on the blog when I first made it.
When I first started casting, I was using a very small pressure pot. In fact it was a paint pot. I had to turn it on its side to be able to make the larger molds. I could barley get my hand in and sometimes it was sloppy. So I was pretty happy when I found the one I am using on sale for $70.00. But it is deeper than it is wide. And that made for alot of empty space. So I made a small shelfing (apparently thats not a word...hmmm) system.
I cut 3 pieces of thin paneling. I put one on the bottom of the pot, because the pot is curved. Then I took the other 2 and drilled some holes, used some All Thread and a few nuts/washers and made a the shelf unit to fit inside the pressure pot. Now I could make more molds at once. At the very least, I didnt have to keep reaching all the way into the bottom of the pressure pot.