Right after the entrance into the citadell to the right.
From the first rotating disc to the right and after the rotating disc that looks
like a deformed 8 to the left.
On the way to the Red Eco Sage in front of the puzzle bridge.
On the way to the Yellow Eco Sage right next to a precursor orb container and
a precursor platform.
Continue from the Yellow Eco Sage to the right over three rotating discs to a wooden scaffolding.
On the way to the Blue Eco Sage. Right inside the madness mess out of floating platforms
and rotating cubes, after the drunk platforms that you activate with blue eco.
Right in the middle very high up. You can reach this scoutfly only once you already freed
3 Eco Sages.