Construction Lines is a precision CAD-like modelling tool for Blender by Dan Norris. Users can create servant edges and points that snap into place for accurate measurement and modelling. The tool also allows drawing rectangles, circles, and even arcs inside the 3D viewport, along with grid snapping, extruding, and cutting through meshes.

Dan Norris – Construction Lines Blender Features

• Draw and shape: You can create lines, polygons, circles, etc., in three-dimensional space.
• Snap to grid: Shapes will snap into place perfectly aligned like magnets.
• Measure and be exact: You can measure precise details and create things to the desired size.
• Cut and shape: You can cut and shape the forms as desired, creating new forms.
• Copy and paste: Shapes can be copied, and many can be created quickly.
• Rotate and move: Objects can be rotated and placed into position freely.

Construction Lines Overview

Image: Build snappable guide points and edges, draw lines and primitive shapes in place.