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