I remixed DaveDux3D's work. His design was a bulkier TPU effort, where he wanted the TPU to act as a bumper of sorts. However, I don't feel that approach is very effective, as the TPU transfers too much kinetic energy directly into the Avata's frame. The new approach I've taken, I've eliminated more than half of the material (make them MUCH lighter), and I'm actually printing them in PLA. The main reason for this, is that the guards are simply meant as a mounting mechanism to allow you to zip-tie on Polyurethane Foam (like what you find in high end packing materials) to the drone. The benefits of this are many:

1) Polyurethane Foam is MUCH better at absorbing kinetic energy than TPU.

2) You can have as much or as little Polyurethane Foam as you want! Allowing you to dial in the amount of impact resistance you'd like to have, verses flight characteristics.

3) You can easily shape the Polyurethane Foam to allow you to have more protection above and below the drone, giving you more protection from more angles, as you can see in my photos. Again, you have to weigh your designs against aerodynamic considerations. The bigger you make your surface area, the more drag you're going to have, the more it will catch the wind. But you can experiment and dial it in how you want it!

4) The PLA print + Polyurethane Foam is less than half of the weight of the original design.

Other thoughts:

It's possible that the PLA will provide significant force deflection, acting like a "sacrificial" duct guard, if you choose to run it without any Polyurethane Foam padding. Though that was not my design intent.

It is also possible that you could print this in TPU, and it may actually provide better protection than the original, as there is now more opportunity for the TPU to deform, and absorb the kinetic energy before it transfers it into the drone. Though I'm not sure how well this new design will attach using TPU. I'm testing print it now to see. But it's possible it won't have enough structural strength in this configuration to hold on with TPU. Though if it could, TPU would probably be a better material than PLA for this.