As I was scavenging through scrap piles, I began to think it would be a good idea if I was able to melt down some of the random metal parts i find like door knobs that I have no use for at the moment and be able to use the molten metal to craft materials that I would have use for at the time.

The suggestion being allow for the melting of metal materials, crafting of molds and using molds to craft other materials (i.e. saw blades).