This is my variation of the Pull Copter. It functions similarly to other Pull Copters available for printing, but with one important difference that I haven't seen on any I've seen yet. Instead of being driven by a gear and an accompanying ‘toothed’ key, this version relies on a combination of string and tension provided by rubber bands. Pull the string to make the rotor fly and the tension from the rubber bands rewinds the string automatically, resetting things for the next flight.

The rotors fly really well, but I don't recommend using it indoors. It will work fine, but I found bits of paint from our ceiling on the edges of the blades. If planning to use indoors, I'd recommend printing a rotor in TPU. This will soften impacts to the ceiling. The rotors will fly really high and carry really well in a large open area.

Needed Parts and Materials

1x Body

1x Shaft

1x Barrel

1x Key

1x Pull Handle

1x Rotor

1x String or Twine

1-3x Rubber bands (depending on the size)

1x Crayon

Instructions

You can find an instructional video on assembly below.

Give It A Whirl - Pull Copter

0.2mm layer, 4 walls, 15% infill

0.2mm layer, 2 walls, 15% infill