I've made 3 mini-column molds this week. I stand it upright in a juice pitcher with a heating pad wrapped around it. A couple of inches of the mold extend outside of the pitcher. I bury everything in towels for some gel action. Two of the three ended up with a slight bend, probably because I was too heavy on the towels. Anyhoo, I'd be interested in how you all set up a mini-embed mold overnight? Hit me up if you've got a hack!