This is how I pour copper bars using a Devil Forge furnace and 8kg crucible. Longarm made all these bars, so watch for new videos coming up on his channel.
Too a lot of us, it's mostly a hobby. Albeit, it's a hobby that envolves, a lot of fire, molten metal, and for me it has a strange side effect of now I look at most metallic things a bit differently. (Wonder what kind of metal that's made from, & what it'd take to melt that down?!?!)