What would cause this problem? Would it be that the roughing and finish tool paths not lining up? The job was built in Vectric x-carve desktop. Zeros where set using OpenBuilds Control probe-plus in the lower left corner. Roughing used 1/4" end mill, finish used 1/8" ball nose bits.
No, you can Probe Z after replacing the bit, just don't Rezero XY - as the centerline of all bits are the same, but their lengths differ.