A while back I wrote this post about building my own vacuforming machine. I've since added a vital warning label to the oven section:
I'm still trying to decide what to put on the short sides by the hooks that hold the frame up. Since they're sharp and I've already managed to cut my head on them a couple of times, I'm toying with "CAUTION: THIS THING WILL EAT YOUR HEAD."
Any thoughts? Please leave suggestions in the comments.