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Push the Printhead to the centre of the build space.
Adjust the height of the IR Sensor Bracket so it is level with the Nozzle.
Secure the IR Sensor.
Power on your BigBox.
If all is well you should see three temperature readouts, two nozzles and the heated bed. If you have a MAXTEMP or other error please refer to the support section of the BigBox forum at forum.e3d-online.com