Free Easy Non-Stick Ingot Molds for the Home Foundry 

Go for it! Good luck

Thanks, this method has worked well for me for several years now

Thanks! It works in a pinch and saves wear and tear on your muffin pans compared to pouring directly into them, but I've learned that if you rely on it to much can be really hard on petrobond sand. If you want to try this I would suggest experimenting with greensand. Or the cement bonded sand recipe that can be found on @sandrammer 's channel. In theory that could be used to make a semi-permanent ingot mold that you wouldn't have to keep ramming up every time. I' be been meaning to try that myself.

Aw shucks 😉

I would trust 1/4" thick steel molds with a good coating of black oxide not to get copper alloy ingots brazed into them, but this works for me. I can usually get several uses out of a mold like this if I'm careful not to damage the mold dumping out the ingots. However the mold cavities deteriorate with each use. But who cares if the ingots are lumpy? Their only use it to get melted again later anyway!

Preheated thick steel molds, I meant. Of course, another plus I forgot to mention about using molding sand is the ingots molds don't need to be preheated...