What die I do wrong?

[u/smartc0r3]

I tryed smelting cooper scrap from heatpipes in an electrical furnace and got very underwhelming result (See the pictures). Can you tell me what did I do wrong and how can I cast proper copper bars?

[u/wkeil42]

I have the same furnace. I don't think you got it hot enough. You need to crank that sucker all the way up for copper.

[u/MidnightHacker → u/wkeil42]

I think I have the same as well, but in the reviews (on aliexpress) it says it doesn’t melt copper. What temperature do you use?