Halyard Stopper Ball — Parametric (3D Print, Free)

FREE parametric HALYARD STOPPER BALL by MarineLab3D. A ball stopper that threads onto your halyard (or any line) and stops it from running up into the mast or through a block/sheave.

📏 Through-hole = halyard Ø + 1 mm (set your line size)
🪢 A wider seat (+75%) at the bottom houses the stopper knot, blended to the hole with a chamfer (svasatura)
🟢 Rounded / eased openings so the line does not chafe
🌀 Spherical body — smooth, snag-free

🧵 Best printed in PETG, ASA or Nylon for outdoor/UV durability.

Use “Customize dimensions” to set your halyard Ø, preview in 3D, then download free.