spur gear 3d model

Create a clean industrial CAD drawing sheet of a functional 3D printable spur gear. Include front view, side view, isometric view, and cross-sectional side view. Specs: 12T spur gear, module 1.5, outer diameter 21mm, total thickness 8mm, reinforced cylindrical hub, perfect round 6mm through bore. No D-cut, no keyway, no decorative holes, no front face screw holes. Add one horizontal M3 set screw hole entering from the side cylindrical surface of the hub toward the center bore. The set screw hole must be on the side, not on the front face. Black PETG plastic appearance, symmetric teeth, white background, precise mechanical part, dimension labels: OD 21mm, bore 6mm, thickness 8mm, M3 side set screw, module 1.5, 12T.