Create an isometric drawing with a template. We are the most comprehensive library of the International Professional Community for download and exchange of CAD and BIM blocks. Free 3D CAD models including AutoCAD 3D blocks, free sketchup components, Revit families, solidworks models and 3ds max models for use in your 3D CAD designs. Download Free AutoCAD Blocks on our site. For downloading files there is no need to go through the registration process. Before the advent of CAD, we created an isometric drawing with our T-square (or drafting arm) and our trusty 30-60-90 triangle.Isometric cad blocks free dwg format) Bed isometric.