TwirlyBird - Adjustable blade pitch hand helicopter

thingiverse

This helicopter toy boasts adjustable blade pitch and a considerable weight upon printing, making it challenging to initiate flight by hand due to insufficient spin speed. To achieve optimal flight, attach a string around the stem and insert into a PVC pipe before gently pulling the cord for increased rotational force. As for printing, Cura is recommended as a slicer with teardrop-shaped rotors on the bed, 6mm bottom/top layer thickness for sturdiness, and 20% infill for strength. Print other parts at 100% infill, especially the stem for stability. Assembling this toy requires care; align small gears with slot gears' key-ways, insert into gearbox, slide rotors in (teardrop point up), secure with cotter pins, and glue the stem using removable white glue. Safety precautions include adding a launching tube to prevent rotor injuries.