I couldn't find any good Helicarrier models online, or at least one for 3D printing, so I made one myself. It's probably only about 80% accurate and fairly low poly, but it looks pretty decent as a small model. I might refine it as time goes on.
There is no scale. I couldn't find an official size for the Helicarrier. So I just made it approximately 12" for a nice, decent-sized model. You should be able to scale to approximately 50% of the current size and it'll probably look okay (although you'll lose some detail around the engines and the control tower). At larger sizes the general lack of fine detail will start to become apparent though.
For the flying, even less accurate version of the Helicarrier, check here. This version is more accurate, but is not intended to have quadrotor parts added (although they share a cutout in the hull).
Printer Brand:
MakerBot
Printer:
Rafts:
No
Supports:
Yes
Notes:
Pins may or may not be necessary. I ended up not using most of them.