I’ve seen way too many people using muffin pans. I’ve even seen somebody using a drywall mud pan(for aluminum). How do you dump your excessive material? A recent post here, got me thinking with cast iron muffin trays. My thinking is there not very stackable and they go back into a bucket. So..., Tonight I built some small ingot trays, just out of some leftover U channel. They only have about 21”³ ea. (1 1/4”x 2 1/2” x 7 1/4”). I cut the ends at 5°. And the U-channel walls, have about 20°. These might be great for aluminum and copper… but would they be OK for cast-iron too? (I only got one of them welded up before I ran out of gas) I hate paying the argon man!