My Utility Knife - now with optional keyring hole

I work retail and open boxes and packages all day. I need a utility knife I can carry in my pocket, open with one hand, and change the blade when dull. This little guy is 6mm thick and rounded all around for easy carry. The textured thumb pad gives grip for sliding the blade forward and back. Locks in position forward and back. Dimensions are ~72mm long, 28mm wide, 6mm thick Using .2mm resolution and PETG, it takes about 45 minutes to print and consumes about 3m or filament. Caution: It is a small, thin, knife that uses a razor for the blade. Be careful. It's not for carving or prying. Use your head. EDIT: Someone asked for a hole so it can be hung from a keyring. Why people want stuff hanging off their keyring, I'll never know, but who am I to argue? Files identified with “Keyhole . . . ” have a 5mm hole so the knife can be attached to a keyring.