heavy gym barbell 3d model

Create a high-detail 3D model of a heavy gym barbell based on the reference image. Style: Semi-realistic cartoon style with slightly exaggerated proportions. Thick, bold shapes but physically accurate structure. Glossy black weight plates with subtle rounded edges. Polished metallic silver bar with realistic knurling grip texture. Structure: - Standard Olympic barbell design - Large weight plates on both sides (4 large plates on left, 3 on right) - Cylindrical collars locking the plates - Clean mechanical symmetry - Slightly thickened proportions for cartoon look but structurally correct Technical Requirements: - Real-world scale in millimeters - Total bar length: 2200 mm - Grip diameter: 28 mm - Plate hole diameter: 50 mm - Plates must be separate mesh objects - Watertight mesh (manifold) - No non-manifold edges - No floating geometry - Clean quad topology - Optimized for 3D printing - Export as STL and OBJ - Unit scale: millimeters Output: Single centered model, origin at center of bar. No background, n