AcroBrat Duct V1

After printing the CineBrat ducts I tried to make my own design to improve efficiency and weight.
HQ T3x3x3 just fit without trimming the blades.
There is one for front left and rear right and a mirrored one for the other two arms.
On the pictures you can see the difference between the CineBrat ducts and my design.

I intentionally created a front right & back left (FR_RL) and a front left & back right (FL_RR) duct to match the frame with one spoke to reduce the drag in the duct as you can see on the 4th photo.
For the same reason the spokes have a kind of a drop shape and the outer shell has the "perfect shape" (except the height) mentionned here: https://capolight.wordpress.com/2015/01/14/quadcopter-rotor-duct/


UPDATE 19.05.2019 : just added some with holes for the motor cables along the arm