Is this model in millimetres or inches?

Neither STL nor the OBJ subset this release supports declares a unit or an up-axis authoritatively, so an import of either format starts from millimetre, right-handed Z-up defaults and records exactly that choice as provenance. glTF/GLB and 3MF are different: both declare their own frame (glTF/GLB always metres and right-handed Y-up; 3MF its own unit and right-handed Z-up), so an import of either resolves that frame from the file itself rather than defaulting -- still shown here, and still overridable. This page leads with the resulting dimensions and the control that lets you say the file actually meant something else -- open below.

Reinterpreting a unit is a deliberate, provenance-recorded choice you make before inspecting, never a silent rescale: the source unit and axis you select stay attached to the result and are shown next to what the file itself declared or suggested.

This page leads with one question; the rest of the report is below. Open the full Inspect report →