Manual Jet Fan – Hand-Powered 3D-Printed Blower

Experience the thrill of real airflow powered by your own hands! This manual jet fan uses a clever pull-string rotor system to spin a high-speed impeller that pushes a strong blast of air through its precision nozzle — no batteries, no motor, just pure mechanical power. Features ⚙️ All-in-One STL File – includes housing, nozzle, rotor, intake lid, and pull handle in one ready-to-print model. 🌀 Pull-String Drive – wrap a thin cord on the built-in spool, pull sharply, and feel the jet of air! 🔩 Easy Assembly – simple 3 mm pin or smooth rod for the rotor axle; no electronics required. 🧱 Durable & Compact – designed for PLA or PETG; fits on printers with ≥200 mm bed. 🌱 Eco-Friendly Fun – powered entirely by motion — perfect for kids’ science demos or maker projects. How It Works Print the single STL model and clean any support material. Insert a 3 mm smooth pin or screw as the rotor shaft. Tie a string to the pull handle, wrap it on the rotor spool. Pull fast — watch the rotor spin and air blast from the nozzle! Specs Dimensions: ~150 × 140 × 80 mm overall File format: .STL (ready to slice) Print time: 5–6 hrs (0.2 mm layer) Materials: PLA / PETG / ABS Infill: 40 – 60 % recommended Perfect For STEM classrooms 🧠 Science fairs 🎓 DIY makers & hobbyists 🔧 Demonstrating air pressure & motion 🚀