This is remix version of the Knife model created by BlacksmithingGamer. I separated blade part from the handle and added peg to fit it after printing, works like a charm. You also can add some super-glue to the peg to make connection stronger, but for me everything works great even without glue. I also scaled model to make it closer to the real world thing and make it perfect to fit in the hand.
Download from thingiverse