3D Robotics Multirotor Reinforced motor fixing

An improved motor fixing for 3D robotics multirotor frames. I've found many times when I've had an uncontrolled landing with my drone (sometimes upsidown!) That the aluminium arms get bent where the motors are bolted onto them. This weakens the frame and in extream cases can cause the motors to become loose and detach completely.

These two parts along with 2 M3x25mm Alen head bolts completely solve the problem. The main part slides inside the box section making the aluminium significantly stronger, it also has two lugs to keep it in place while being assembled. The second part is bolted on the bottom of the tube and works a bit like a nyloc nut, the bolt heads dig into the plastic so the bolt can not vibrate loose. This is a single use part, you'll need to print another one if you remove and re-fit the motor.

This model is for one fixing only, so you'll need to print 4 or 6 of them for your quad or hex copter.

The end result your motor fixings are much stronger and far stiffer than the standard 3D Robotics design.