Just a mod to add a few recipes to the crafting grid that seem appropriate. Includes recycling used metal tools and panned copper items into their respective metalbits. I would love to find a way to add a line of code to this that would reject the recipe if the chisel(tool) was lower tier than the item being recycled. If C<I kinda thing?
Also considering adding rusty gear to iron conversion.. 
This mod probably already exists in some larger fashion, but I needed to learn the ropes of this anyway.