Here my design of this FPV Hybrid Frame, I called "THE IGUANA", I was printed it with PLA with carbon fiber arms, the bottom shell is easy to modify for different kind of arms.
It was designed for Cruising or Freestyle not for race. I recommend put in it bigger motors.
You can see more details in the video, is very easy to build, just print the parts and put all together, I used a typical hardware for FPV frames like M3 screws and standar tube nuts.
---- Details Video ---
Links for free download 3D files:
--Thingiverse link - https://www.thingiverse.com/thing:3390049
--MyMiniFactory link - https://www.myminifactory.com/object/3d-print-fpv-drone-hybrid-frame-260mm-the-iguana-84371