Time Traveler: Dark Ages (v1.0)

You are time traveler, and for some reason you decided to visit the dark ages. War, famine, and plagues spread across the land. The only thing you brought with you is a trusty "companion" in the form of a futuristic watch on your wrist, that can 3D print objects for you within a matter of seconds. How will you impact this unique yet horrifying time period?