Small, modular quadcopter frame

Attempt at making a small, printable quadcopter frame. The center plate and arms are printed separately so they can be replaced as needed.
The assembly is held together by nylon bolts that go through pockets in the base which hold the individual arms. The bolts I chose were long enough to also double as landing gear legs.
In order to stiffen up the arms I added braces from the bolts to the center of the four arms, to be attached there with zip-ties.
The hole pattern on the arms fits the mo