I Have a 3d scanner and imported the scan as a OBj, it imports fine, but when I go to sculpt, the tool is off centered and the symmetry doesn’t work correctly. After I import the OBj, and save it as a tool, how can I get it to be calibrated? Or am I importing it correctly? Thank you for your time.
The simplest is to use Tool>Deformation>Unify. This will scale the model to one ZBrush unit and center it.
If scaling the model would be a problem you can instead use Transform>S.Pivot. This tells ZBrush to set its working center at its geometric center so that all deformations and symmetry work correctly. However, the model’s true values will remain unchanged for when you export it later.