Whirly One (OpenSCAD)

thingiverse

A whirly-bird gadget featuring a pull string that propels the rotor upwards is available with a handle option. To use, print the build plate along with additional rotors (2 shells at 10% infill are acceptable). Clean out any strings within the hand block, which serves as the winding area. Thread a 1-foot long string through the "bolt" and hand block, secure it by tying a knot, then pull both ends to fasten the bolt in place. Attach a rotor on the square peg, wind counterclockwise for 4-5 turns, avoid overwinding to prevent binding. Firmly hold the block and swiftly pull the cord; the rotor soars towards the ceiling. Be cautious of clockwise winding and hard surfaces as they may damage the fragile peg. The rotor wing pitch is parametric, with 30 degrees being the default angle, while 45 degrees work but perform poorly. Additionally, an optional outer rotor ring and a handle are supported in the OpenSCAD model.