Last time I had my plane out to fly I had a rather hard landing that broke the motor mount. I expect that I'll probably do that a few more times, so I built a model of a mount and 3D printed a few of them on the Omaha Maker Group's 3D printer. I made the model to the exact size, so I had to do some filing before I could get it to fit properly. I'll have to keep the oversized printing in mind next time.
The plan is for the mount to break along the print layers next time I crash, to avoid damaging the motor shaft. I'm sure that plan will be tested.