🧗 Pulley Splint for Rock Climbers — A2 / A4 Injury Designed by a mechanical engineer, tested in the real world. This pulley splint was born from a personal climbing injury and refined to actually work — not just look good on screen. 🔒 What makes it different:• Ratchet locking mechanism — lift to open, press to close. Stays in place during activity, no slipping• External O-ring groove (2.62mm / 0.8mm deep) — standard NBR O-ring adds retention and prevents the ratchet from opening under load• Engineered geometry — compression on the palmar side where it matters, clearance on the sides to protect nerves and blood vessels• 4 sizes included: S (20mm) / M (22mm) / L (24mm) / XL (26mm) — inner diameter 📦 What's in the ZIP:→ STL files for all 4 sizes (S / M / L / XL)→ Sizing Guide PDF — how to measure your finger in 3 steps→ Print Instructions PDF — layer height, material, orientation, O-ring spec 🖨️ Print settings (critical — read before slicing):Material: TPU 95A (recommended) or PLALayer height: 0.10–0.12mm — required for O-ring groove accuracyNozzle: 0.25–0.40mmNo supports needed ⚠️ Not a medical device. Always consult a physiotherapist for serious injuries.