For people who have built (or are building) this printer, take note that the X-Endstop is on a different side to usual. Depending on your firmware you may see mirroring of prints. You can easily fix this by plugging the X-Endstop into the X_MAX_ENDSTOP that can be found right next to the X_MIN_ENDSTOP on a RAMPS Shield.
This can also be done through firmware, but I had terrible trouble in Marlin with it. Using this method is super simple.