Notes about the printed model
This design is a reasonable start to an F22 project. The modeler may have to work the ends to accept their favorite N scale couplers. There is no coupler mounting built into the model, and some of the end/frame may have to be removed.
The MicroTrains trucks bolster pin fits tightly and the trucks clear the frame when a spacer is added.
The trucks may need a spacer in case the wheel flanges rub against the frame. This may be necessary anyway, because the car may have be be raised a bit to mount the couplers.