spring winding mandrel 3d model

Ultra-precise 3D printable spring winding mandrel for 1 mm steel wire. Solid cylinder Ø 15.00 mm, length 300 mm winding section. Continuous helical groove: width 1.10 mm, depth 0.80 mm, bottom radius 0.55 mm. Pitch exactly 2.30 mm, right-hand helix. One end: standard 1/4" (6.35 mm) hex bit shank, 30 mm long, sharp faces, 2 mm shoulder. Other end: 45° chamfer. Fully solid, manifold, watertight, no thin features, extreme rigidity. Pure mechanical CAD geometry, ±0.05 mm accuracy, optimized for PETG 100% infill FDM printing. No organic shapes, no artifacts, no decoration. Negative: cartoon, lowpoly, artistic, deformed, twisted, holes, non-manifold, fantasy, decoration, soft edges