spur gear 3d model

Create a standard spur gear with a stepped hub design: module 2, 17 teeth, pressure angle 20°, face width 15mm, nominal shaft diameter 8mm. The hub features two concentric cylindrical protrusions (stepped collar) extending from the central bore, creating a distinct two-level profile. The gear has a solid structure, smooth metallic finish, closed mesh, no broken surfaces, and is optimized for 3D printing without supports.