Is there anything to do with multiple crafting items?

So it turns out crafting items (crafting kit, alchemy box, ingot press etc.) can be stacked, but I couldn't understand why would I ever want more than one of those. Is there any reason to hold on to spares, or should I just sell them?

I haven't yet found any use for the multiples. I just sell them when I get the chance.

The Tinker's Parts can be used as an ingredient to craft the Trapper's Toolbelt, so that (to the best of my knowledge,) is the only crafting item you would need more than one of (one as an ingredient one to craft,) and might want to keep stacked (until you need it and use the Alt/Apple key to split them.)