These mounts are made for the REV Robotics expansion hub and battery as well as a Moto G play for FTC robots. It doesn't matter which side each part goes on so long as the battery mount is in the middle. The phone mount is purposely made slightly shorter than the actual phone, as this makes it easier to take the phone out of the mount. The Makerbot files are set for the 5th gen Replicators with a Smart Extruder+ using PLA printing at 10% infill with 5 shells.
The Makerbot files provided are to be used with the Smart Extruder+.