Quote from Prince_Deity
Overpowered. Say you use up a diamond sword to almost being broken, then you pull it apart and put it back together. Instant repair.
And even if you could not put in anything that is damaged, you could just use whatever item you want for as long as you need it, then just pop it apart and use the materials in something else.
Just seems like it would make it so you don't have to go out and collect as many materials;
I would assume it would take durability in mind and give you materials accordingly, if it would accept tools at all.
A nearly broken diamond sword, say about 10 uses, it would probably only give you a stick or so.