sports calf guard 3d model

3D printable sports calf guard for electric unicycle. Organic asymmetric shape like motocross knee armor or beetle shell — deeply curved, NOT a box or rectangle. SHAPE: Kidney-bean silhouette, wrap-around form that hugs calf muscle. Deep concave hollow on inner side. Aggressive forward-leaning tilt. Smooth flowing outer surface, structured inner surface. FRONT: Diagonal row of 7 triangular cutout vents punched through surface. Two diagonal raised ribs crossing face. Flexible crease line across middle dividing upper and lower segments. Upper segment in contrasting color. BACK: Tall curved spine wall, diagonal stiffening ribs, one diamond open cutout for weight reduction. BASE: Flat foot plate at bottom, 4 bolt holes at corners, perimeter groove, smooth fillet blend into body. Style: biomechanical armor, aggressive organic form. Material: flexible TPU appearance. Output: watertight STL, fits 400x400mm print bed. NOT geometric, NOT boxy, NOT symmetrical.