JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Concentric 3D Constraint Used to constrain the faces, edges, or vertices of two 3D elements to be concentric. You can access this tool from the following: Ribbon: Modeling > Constraints > 3D Ribbon: Drawing > Constraints > 3D Toolbox: 3D Constraint Tools Key-in: CONSTRAINT3D CREATE CONCENTRIC To Apply a Concentric 3D Constraint Parent topic: Applying Constraints