I'm uncertain as to what you are asking. Precision in terms of what? 3 dimensional reproducibility? Not as critical in medical applications as for the gears used in folding screen cell phones. After all, all folding screens are held to tight specifications. Each screen is very much like the rest. Not so with the human body or any of its parts. -- E.g., when choosing a certain size intravascular stent, (something I know a lot about) we take careful, but approximate, measurements of the vessel diameter and try to match the size of the stent to that vessel. But it is a close approximation, and certainly no where close to the .008mm tolerances of parts made with liquidmetal IM. The same holds true with joint implants: close approximations.