Coop, I was thinking we're taking your thread way off track.
There are still so many people trying to get down the basics of good photographic lighting, that all this talk about Photoshop and combining multiple images might be distracting.
I'd like to say that until you can take good sharp photos of a single knife that you really shouldn't concern yourself with doing composites like we're talking about here.
What you may want to do when you're first photographing knives is to cover all of your bases so that if somewhere down the line you do want to do a composition, you'll already have the photos. Try this, lay the subject knife down on the table with the edge toward the camera and the point of the blade on a diagonal to the upper left corner of the picture frame, take the photo. Now rotate the knife so the point is towards the upper right corner, snap, lower right, snap, lower left, snap. Now turn the knife over so the edge is away form the camera, take four more pics pointing at the other three corners. You now have eight images of knife. If it's a folder, I would take . more pics with the knife closed. Some closeups of the logo and any other details will give you lots to choose from if you ever decide to do a composition later.