Porosity measurement in 3D printed metal parts

For laser powder bed fusion samples we compare Archimedes density with micro-CT. The two methods disagree by about 0.5% porosity. Is that typical? Which one do you trust more for publication?

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@pawel_michalski

22d

Is the CT voxel size small enough to resolve the smallest pores? Unresolved microporosity would explain the gap.

@MarekSzulc

23d

In industry we treat CT as the reference for internal defects, Archimedes as the quick check. A 0.5% difference is not unusual for small samples.