This is a structure that automatically saves what you put in the upper chest using the fuel contained in the right chest to change into the lower chest. (From Minecraft)
What would be the same thing if it was reproduced with RR 2?
Dedicated Slot for Melting … Make a Recycle Box （There are empty slots in the recycle box as many as the number of stocks.）
It is transferred to the slot so as to automatically melt equipments not needed from there. And the blacksmith keeps working until the slot is empty.