Mirage 2000 with ducts.

thingiverse

I caught sight of the mirage that Diymik shared, and he mentioned it's still not taking flight for him. I revamped the two central sections so the ducting is properly in place. The ducting might need some additional smoothing to prevent vortex pockets from forming. When printing this revised set of parts, you'll require a top and bottom layer, unlike the originals. Additionally, you'll need 5 to 10% infill unless your printer excels at bridging.