Here are some arms I made for the 230 and 250 boks quads. I made it so you can still use the vibration dampening system. It is far stronger than the original (pretty hard to bend).
Although it isn't a light part (13g), it is still lighter than the 250bq G10 arms are (20g). I could make the part lighter still but I am happy with the way it turned out.
I have supplied the stl's for the both the 5 inch version and 6 inch version (you can use 5 or 6 inch props). I have only printed the 5 inch version but the 6 inch looks like it is flawless.

Printed in pla (recommend abs for motors that get warm) at .2mm resolution at a 50% infill. You could probably use 30-40% but 50% is plenty. I also used support material.
You will need to mirror 2 of the arms (doesn't matter which axis) for the holes to line up with the other side of the frame.