DJI Phantom 3 motor protection

I recently bought a DJI Phantom 3 Standard. With that, I also bought a nice backpack in which to store and transport my drone.
As you can see in the pictures, the drone is stored (or at least when putting it in the backpack) upside down.
I therefor wanted to have something to protect the motors so that the weight of the drone would not rest on top of the motors but rather on the frame.
I looked around on thingiverse (and 'the rest of the internet'), but could not find one that suited my needs