Multirotor Motor Mount, 19mm x 16mm mounting holes

Rather than wait on replacement shipping for replacement acryllic mounts that break to easily, I decided to create my own for printing. It is designed to slip on the end of 1/4in aluminum or carbon fiber, and has mounting holes spaced at 19mm and 16 mm to mount the motor.
Screw holes are sized for M3 screws.
Part was designed in Solidworks, and then repaired using NetFabb to ensure printability.