I'm agree when you say "rigid frame with no flex" but you certainly know that parts of frame are not flexible if you have a big volume.
The structure is like a "bee socket" empty less than 10% so : it's strong and not heavy...
(sorry for my poor enlish)
Helo guys,
I'm french and my new passion is the "3d printer"
I have one dji phantom,one F450 and now, i want to create a new one only using 3D printer.
You can visit my website ( you can traduce in english) and see my project.
www.rc-impression3d.fr
Thanks and see you...