My 4-year-old son and I always have a project (or ten) on the go; this time his request was for a helicopter. So instead of designing a "regular" helicopter, I though we'd experiment a little. This is the outcome. WIP: Tinker here: https://tinkercad.com/things/6JCXSFmlHID
Intended design is actually exactly twice as small, but because my current MakerBot leaves much to be desired (to say the least), I had to upscale everything ×2 - not necessary a bad thing...
Photos of the finished copter coming soon!