Clip on motor protectors for Emax 2205 motors. Simply clip on the base of the motor as seen in the pictures. There are small tabs which are used removing the protectors, just pull on the side tabs with pliers and they pop off.
Clip on like this: https://www.youtube.com/watch?v=wRoN-NUuWwI
I printed with ABS, 100% infill, 0.2mm layer height