It is likely an issue with your printer (eg overheated, bad read of file, etc). or with the slicing. I would suggest troubleshooting starting with the file that was sent to the printer. If it is just gcode, then import that gcode and see if it only is 3/4 of the model, if so then check slicer settings and make sure you may not have copied the file prematurely. I have done that, where I pulled SD card out too early and was surprised that only 50% of file copied over.
If the file is good then confirm there are no issues with your printer (ie try another large model)
We know its not the model as this is one of the great flagship designs that we all use to show off how great 3D printing is to our friends and family. Great Design.