Use the Extrude, Polyline, Primitive Circle, Sketch Circle, Polyline and Circular Pattern tools and inferencing to model a gear.
Drafting, Modeling and 3D Printing with Lydia Sloan Cline
Hand drafting for Interior Design, SketchUp, Autodesk 123D and MakerBot
Use the Extrude, Polyline, Primitive Circle, Sketch Circle, Polyline and Circular Pattern tools and inferencing to model a gear.