Circumference Tool Plus is an add-on designed for prosthetists, orthotists, and medical modelers to modify 3D scans based on precise circumference measurements. It allows you to add measurement rings directly to a 3D model and view live circumference data.

The tool provides several methods for modifying geometry, including setting absolute circumferences, applying positive or negative radius changes, or scaling by a percentage. It also includes an intelligent volume displacement feature for stretching or shrinking a model between the distal end and a custom anchor point. The add-on employs a non-destructive workflow by creating an adjusted copy of the original scan, making it easy to compare modifications. The tool requires specific unit settings in Blender, operating in millimeters with a metric system and 0.001 unit scale.